Join Date: Jul 1999
Location: Broomfield, Colorado
OK, boys - I finally got healed enough to get back to this little task.
The modifications I made worked great! My seat is now 1 1/2" farther back and over 1/2" lower, everything fits back in the car just fine, and the adjustments still work. I'm 5'11" with a longer torso and shorter legs. When I'm sitting in newly recovered seats with lots of padding there's over an inch of headroom and plenty of leg room!
Here's what I did:
I bought some mild steel 1/8" X 2" strap and cut 2 pieces 16 3/4" long (I used a full length strap for convenience and strength. After removing the seat and then the seat brackets, I placed them each on a piece of strap and lined up the front edge of the bracket with the front edge of the strap. I marked through the floor mounting holes with a fine point black marker.
After drilling these holes out with a 3/8" drill and elongating them into slightly adjustable slots,I measured back 1-1/2" from the hole centerlines and reset the brackets on these points. Next, I measured 1/2" up from the bottom of the foot and marked this point on each vertical leg. Then I marked on the strap where the vertical leg of the bracket would contact it once I cut the "foot" of the bracket off (I used a square and set it on the strap and lined it up with the mark on each leg).
Next step is to cut the foot off each leg at the 1/2" mark. Then I set the brackets in place on the strap and welded them into place.
There's a little bonus here on the seat height. The seat mounting pan on the floor actually slants downward to the rear so the seat gets higher when it's moved forward and lower when moved back. So when you move the seat another 1-1/2" rearward you get more than the 1/2" drop. If you needed more headroom you could even cut a bit more out of the brackets.
Finally, minor adjustments in seat angle and height can be made by inserting washers between the brackets and the seat bottom.
Anyhow, that's my solution. Hope this helps some of you out. Let me know if you have any questions. I'll most likely be doing the passenger side in the next week or so and I'll take pictures if anyone's interested.
'69 400SB, Richmond 5-speed
'99 HD Road King Classic