You are correct, 2.5 inches is actually 63.5 mm
SPL's own product listing says their mid links are made to accept 2.5 inch ID springs
the easiest way to do it is simply to order the springs from SPL at the same time.
Mike at SPL is a very knowledgeable and helpful guy, call him with any questions at the time of your order. He got my sorted when i realized my aragosta springs wouldn't fit. (Bulletproof actually didn't help me much . . . i even asked them specifically if the springs would fit the SPL arms)
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