Especially one from, say, a Mustang touring seat or the like.

My goal is to get the absolute flattest seat possible. Apparently my *** and back are shaped like no one elses, so all the "back support" seats like the Wide Vintage cause extreme pain - I want ZERO back support, but a lot of wide space and foam for my rear to be comfortable. Just like a passenger pillion.

I've ridden mine from the passenger seat of the mustang, and it was quite good, but obviously that isn't a good long-term solution, since I can barely reach the forward control kit like that. Has anyone ever tried to modify one to fit, or does anyone have a suggestion for flat-but-tons-of-foam?

 

You might want to contact Allen at www.meancitycycle.com, see if he can modify you seat according to your spec from you seat pan.

He modified my HD solo reach seat for me and is 100% better, I can ride all day without any discomfort, only stop for fuel and food now and then.