springs - lowering & a3

[foxxinabox at wideopenwest.com (Foxx (in a box))]

   so while i was talking to my friend at a garage tonight he handed 
over some old lowering springs that he'd removed from a rabbit in the 
early 90's. they are yellow and that's about all i know. looks to be a 
decent drop, but i don't know how much and it's raining so i don't want 
to go to the shed and the factory springs i have. any ideas on 
identification?
   also, i'm setting my '85 up to tow (for the near future). i currently 
have 16v springs in the rear, though i've heard a3 springs are stiffer. 
does anyone currently have a set of stock a3 springs laying around that 
they can compare with or might be willing to sell cheap? i should be at 
cincy at least one day for pickup. thanx.

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