Kit Number
51404-10, 54089-10
For model fitment information, see the P&A Retail Catalog or the Parts and Accessories section of www.harley-davidson.com (English only).
Additional Parts Required
Do not install these seat kits on motorcycles that are not equipped with an appropriate grab strap and passenger footpegs. If footpegs and grab strap are not installed, passenger could fall from moving motorcycle or grab onto operator, causing loss of control and death or serious injury. (00410b)
These kits require the separate purchase of a Passenger Footpeg Mounting Kit (50210-06) and passenger footpegs (purchased separately) if installed on a vehicle originally equipped with a solo seat.
Rider and passenger safety depend upon the correct installation of this kit. Use the appropriate service manual procedures. If the procedure is not within your capabilities or you do not have the correct tools, have a Harley-Davidson dealer perform the installation. Improper installation of this kit could result in death or serious injury. (00333b)
This instruction sheet references service manual information. A service manual for your model motorcycle is required for this installation and is available from a Harley-Davidson Dealer.
Kit Contents
Cover painted surfaces with protective material to avoid damage.
  1. For Vehicles Equipped with Solo Seat: Remove rear seat mounting screw from seat.
  2. For Vehicles Equipped with Solo Seat and Separate Pillion:
    1. Remove rear seat mounting screw from pillion.
    2. Remove pillion, grab strap and grab strap mounting hardware.
  3. For Vehicles Equipped with Two-Up Seat:
    1. Remove rear seat mounting screw from seat. Carefully slide seat away from the tank and out of the grab strap.
    2. Remove grab strap and mounting hardware.
1. See Figure 1. A retention nut and washer must be installed in the rearmost fender hole (3) and the middle fender hole (4). If these are not installed, follow Steps a and b:
a. See Figure 2. A cable strap may be used as an installation aid to install the retention nut and washer. Place the retention nut (1) over the cable strap (3) so the wide end of the nut rests on the eye of the cable strap. Thread the cable strap up under the fender and through the appropriate fender hole. Pull up on the cable strap to hold the nut snug against the underside of the fender.
b. With the rib on the retention nut seated into the notch in the appropriate fender hole (see Figure 1 ), slide the retention washer (2) into place from the rear. This will lock the retention nut in place. Remove the cable strap.
1Retention nut and washer (two-up seat positon)
2Retention nut and washer (solo seat position)
3Rearmost fender hole
4Middle fender hole
5Grabstrap mounting hole (two-up seats only)
6Flange screw
7Plastic retention nut
Figure 1. Retention Nut Location
Figure 2. Installation Tool
2. For Kit 54089-10 Only: See Figure 3. Clean the rear fender thoroughly and set the pillion into place on the rear fender. Remove the adhesive backing from each bumper (12), position the bumpers under the decorative rivets on the pillion and install bumpers on the fender. Press each bumper firmly into place.
3. Install top hat washer (11) between shoulder bolt and solo seat mounting bracket.
4. Install solo seat (if removed).
5. For All Models: See Figure 3. Install the shoulder bolt (6) through the grab strap (5) and into the grab strap mounting hole in the fender.
6. Tighten shoulder bolt to 11–18 N·m (8–13 ft-lbs).
7. For Kit 51404-10: Slide pillion (1) through grab strap then and engage the shoulder bolt in the slot in the bottom of the pillion. Slide pillion forward until the pillion is fully engaged on the shoulder bolt.
8. For Kit 54089-10: Slide grab strap between the lower skirt and the top of the pillion. Engage the shoulder bolt in the slot in the bottom of the pillion. Slide pillion forward until it is fully engaged on the shoulder bolt.
9. Install mounting screw (A) through seat bracket (2 or 4). Tighten securely.
Care and Maintenance
For Kit 54089-10: The leather material of the pillion has been pre-conditioned with a leather dressing. To maintain the appearance of the leather, apply Harley-Davidson Leather Dressing (98261-91V), available from a Harley-Davidson dealer.
Figure 3. Service Parts: Kit 51404-10 Shown
Table 1. Service Parts Table
Description (Quantity)
Part Number
Passenger pillion seat
Not sold separately
Seat bracket (Kit 51404-10 only)
Cap screw (2) (Kit 51404-10 only)
Seat bracket (Kit 54089-10 only)
Passenger grab strap (Kit 51404-10 only)
Passenger grab strap (Kit 54089-10 only)
Shoulder bolt (Kit 51404-10 only)
Shoulder bolt (Kit 54089-10 only)
Hardware Kit (includes items 8-9)
Washer, retention
Not Sold Separately
Nut, retention
Not Sold Separately
Cable strap
Not Sold Separately
Washer, top hat
Bumper, pillion (4) (not shown) (Kit 54089-10 only)
Items referenced in text, but not included in kit:
Stock screw