I'm guessing that was a typo on your part, but it says you can ONLY use linear springs. You need a 60mm or a 2.5inch diameter spring with an max O.D of 99mm.
Your best bet is a 7inch spring with a nominal spring rate anywhere from 400-900ib/in. I don't suppose you plan on pulling anymore than 1G of lateral force often, so this shouldn't be a problem.
You'll subsequently need to change your rear spring rate as well or your balance will be off substantially. You'll be chasing damper rate problems until you shoot yourself in the head if you don't.
Good luck
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