I know that you cant on the 750's.
Not entirely. You need the sub frame, seats and side rails from the same bike you get the fender from. The Spirit is a uni seat and the A.C.E. has dual seats.
Also, any reason youre looking at such an old bike? What comes on it and how much do they want?
I think you can. The stock ACE seat is two-piece construction with a different pillion pad and bracket to attach it. The mounting hole in the fender might not be in the exact same spot. Easily remedied.I don't think, that if you are using the factory spirit seat, that you can use it on an ACE fender...
EXACT same on 1100 ACE.Perhaps the ACE seat can. My factory spirit seat mounts like this: Driver seat tucks under tank and uses two bolts on rear to fasten it to the fender.
1100 ACE pillion pad is bolted to a bracket that is bolted to the bottom of the saddle. Rear of pillion pad is secured to fender with a single bolt.Rear pillion then slips into driver seat bracket front, and uses a single bolt that also fastens to the rear fender, only further back.
The brackets are in the side rails that secure the fender. 1100 ACE saddle does NOT bolt to the fender. Only the rear of the pillion pad does.On my newly aquired ACE fender, there are no holes to mount the driver seat to, as before mentioned. it only has the single, rear most hole that mounts the pillion.
If you had another viable option (drilling another hole in the fender) then the reason you MUST use an aftermarket seat is the same reason I MUST: We both hated the stock seat. I can't figure out why but there really are some folks who love the stock seat. Making a stock 1100 Spirit seat work on an 1100 ACE fender is not even as hard as the wiring changes for the brake light.Therefore I must [emphasis added] use an aftermarket seat, that is pillion and driver one peice. Other option would be to drill and tap mounting holes for factory seating...but I hated my factory seat and used this as opportunity to get a Mustang seat.