WANTED: High Seatback for OK Malibu II

So I got a Malibu II for my son and I.  It came with one "Comfort Backrest",
which is not a high seatback, so my son gets to use that one.  I now need a seatback for myself. 

Since I have my main ride (T160) and will only be paddling the tandem a few times per year, I'm looking for a "gently used"  high seatback that will fit on the Malibu II tandem.  I'm guessing pretty much any seatback will fit so long as I get a rivet gun and so some riveting.

Anyone looking to sell an extra seatback?

John, I've got a spare Ocean Kayak seat that came with a T15. You can have it. It should work without installing more hardware too. Just gotta drive to Monterey for it. Or maybe I could drop it off the next time I go fishing up that way.

wow.  thx!!  I will PM you for a trip down to Monterey.  thx again!