I bought a Brawler solo seat at a swap meet yesterday and it fits on the bike with a little work, I had to take the bumpers off the fender in order for it to fit.When I put the stock seat with pillion back on, do I have to have to put the bumpers back on also?

 

I think the bumpers are to keep the seat from wearing through your paint. If it were me, I'd try to glue the bumpers onto the bottom of the seat.