Currently resurrecting an '81 GS550T whose seat pan was toast, i.e. the front mounting shafts were totally gone and the front section mostly rusted out. I'm not going for a perfect restoration, just some type of flat/bench seat to fit my 6'3" frame. I have other small bikes (Triumph Bonnie, CB350) and the flat seats work well.
My seat options are:
1. Find an exact replacement on fleabay. Could be tricky since the T was a relatively rare model
2. Build a seat pan out of wood, fiberglass, etc.
3. Buy an aftermarket ebay seat
4. Re-use a seat pan from some other GS model? Is this even possible, i.e. would the front and rear mounting points line up? This would allow me to re-use the keyed seat switch on the rear of the seat.
Relevant pic of project is below

Thanks
I found the old thread pasted below, which is close to my question, but not exactly the same
https://www.thegsresources.com/_forum/showthread.php?220495-GS850L-seat-de-hump-before-and-after
My seat options are:
1. Find an exact replacement on fleabay. Could be tricky since the T was a relatively rare model
2. Build a seat pan out of wood, fiberglass, etc.
3. Buy an aftermarket ebay seat
4. Re-use a seat pan from some other GS model? Is this even possible, i.e. would the front and rear mounting points line up? This would allow me to re-use the keyed seat switch on the rear of the seat.
Relevant pic of project is below

Thanks
I found the old thread pasted below, which is close to my question, but not exactly the same
https://www.thegsresources.com/_forum/showthread.php?220495-GS850L-seat-de-hump-before-and-after