Jan,
I just got back from SUNI 3 so forgive the tardiness of this post.
I recently put together some seats for my friends S 5 Alpine. The threads are 
BSF on the brackets that bolt to the upper seat frames and on the screws that 
hold the hardware for the seat locks and such on the seat bottoms. The pivot 
bolt has too coarse a thread to be BSF and they were fine so I didn't mess 
with them. We did however tap out the 1/4" screw threads on the seat bottoms 
to use 1/4" 24 tpi screws. 
Just a note to let you know not everything was USF on Alpines. 
Dave Green
Tucson, Az.
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