Looking to fit Focus ST170 discs to my mk 3 Tina hubs...problem is they're 24mm thick where the spacer kits are 22mm..not sure if they're available in different thicknesses..i know theres a couple of mm either side of the stock discs..will i get away with a little grinding here and there if...

I'm running a Rover V8 with an Edelbrock performer dual plane manifold and 500cfm carb. Got a best time of 15.2 at the strip. Tried putting in a 1" open carb spacer to see if it did anything. Ended up with a 15.1, but that might not have anything to do with the spacer - I'd done a bunch of other...