Calvert mono spring question

I found a pair of Calvert split mono springs someone locally has posted for sale for 200. My question is would they work with my car. I have a 70 swinger with a 7 1/4 currently but I have a 8 3/4 from a b wagon car that I’m wanting to put in. Says they are split mono 2000 but I can’t seem to find info online to see if they would work. Anyone that would know anything please give me a heads up. Thanks! I attached a picture file from his ad.

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