Parts ID Help please!

Looking at a set of springs on Craigslist. Seller is about 2 hours away.

Seller doesn't know brand; they're blue, he says they're for a Fox body, and lower car 1 inch. Only identifying marks are the following numbers printed on the springs themselves:

13 6-26 5-107 5-64



Will these work on my 95 GT Vert? Anyone know what brand they would be? Are they worth $50?

Thanks

Bump--can anybody help me out? Need to know what these are (if identifiable from the pic and number in the text below) and whether they'll work on my 95 GT vert. I'd like to buy these this weekend if they will.

Thanks,
Greg