Cable Tranny

[southpaw925]

So I'm looking for a cable tranny and I find this guy that says he has a B17 for me.Now the tranny off the block so there is no way to tell. On the tranny the gold sticker says S1-1082857. Also it says YSK-1. If anyone can tell me what to look for or if this guy is being legit it would be appreciated.

 

[airosey]

Tranny's of the same code can have different gear ratios.
My 91 LS tranny says S1 on it, but not sure about the YSK1.
Chris