Anyone make a new seat pan out of sheet metal? I have nice foam but not trying to spend 250$ on a full seat from that taxavina website for a seat. my pan was rotted so bad that there was nothing left of it.

I know (and apologies!) that it's stating the obvious, but fleabay might be your friend here.

Widen your search to include any Yamaha seats of that era and compare them to your own. Many items are incorrectly described/identified by the sellers (not deliberately), so you might find what you need.

i look all the time and cant find one worth buying

Hi! Not sure if it's the same type though I have one on a DT100 (1975?) seat in good condition that I can sell.
Not sure where youre located - Im in Australia.
Cheers!

I have seen others on this site use fibreglass to fix seat pans. Fibreglass was applied directly over what was left of the seat pan.  Pretty clever solution I thought. 

As someone who went from googling "is epoxy the same thing as resin" to fiberglassing my own flat track tail section all within a month span, I am going to second this suggestion.

If the old pan is metal and rotted rusty - I'd tape the top of it with masking tape. Flip it over. Lay the glass right on the underside and ensure it meets the shape. Do like 3 maybe 4 layers of cloth mat with epoxy resin. Let it cure. Theres your new seat base. Its not visible so who cares what it looks like... It'll be strong enough for new seat upholstery. But then again, maybe don't do what I would do cause I'm new to fiberglassing and there's probably a better way. 

I'm almost done the process of sanding primer sanding primer wet sanding, etc. Here's a pic when it was one uniform color. I will be fiberglassing an actual seat base for upholstery next.

There was only a tiny piece of the pan left. the rest was gone so i have no template, wondering if theres a way i can make a mould out of the bottom of the seat foam to get a shape? im gonna do some research. thanks everyone. id definitely try to make one out of fiber glass if i can

www.interstateplastics.com/Polyshape-Non...boo02Z0aAlYoEALw_wcB

wondering if i can use this to press into the bottom of the foam and once it hardens i can maybe pull it off and fiberglass over it

Maybe make some sort of pattern to mate to yer seat with 1/4" plywood? Then get to covering with fiberglass
Sneezles61

 One on eBay if it’s correct?