You may or may not have to cut down your existing studs. That all depends on how long your studs are now. Basically, if they're more than 25mm long, then they won't fit inside a 25mm spacer. Can you run your current wheels on studs of that length? You'll have to tell us.
I will take a look but I can't see how that would work. Jag part number c2s50885 says it is m12 x 42mm according to one site but I'll measure when I get a chance to take everything apart.
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