So I decided to tear into these things a bit. I need to order some parts, but I need to see what exactly I need. I figure you guys would like to see how these come apart too.
These seats are pretty simple really. Nothing complicated about them.
First...the bottom
For the most part these are all the same. Standard 6 mounting holes on the edges, and a rubber/fabric trampoline/diaphragm that supports you. These commonly fail, as you'll see on the other seat.
Mustang Recaros are different. I believe they are Recaro seat backs on Ford bases with Ford tracks. The VW seats with manual tracks are the same way. Recaro back on a VW base. The VW with powe tracks (such as mine) are the standard Recaro bottoms
Here's how the tops separate from the bottom
There's a plastic trim piece that goes here. In typically Mustang 5L5 fashion, I tracked down some NOS VW trim from Germany for a good price actually. Originals will get trashed. But anyway, remove the plastic and you see this. Front pivot has a clip like an E clip (removed in this photo) and when you recline the seat, this is what it pivots on. Rear pivot is the seat recline catch.
Hit the flip foward lever and it releases like this
Should be obvious how they come apart at this point. Remove the clips, spread the bracket apart slightly and off they come
Final result. You can see they are the same on both sides. The aftermarket seats come with tilt releases and recline knobs on both sides for use in RHD and LHD vehicles. On the OEM seats, you only get one. Recline knob is on the inside and flip forward lever on the outside
Seat backs are in great shape and bolsters are solid so I'll likely not take those apart right now. Seat bottoms are a different story. Need to replace one diaphragm and inspect the bolsters and see how many I need to replace. Stay tuned