Sorry I know this is an old thread. Haven't graduated to the .2 yet. Picked up the following for a T4.1 12mm hex conversion.

-Jconcepts #2170 front axle 12mm hex conversion kit
-Associated #9883 wheel hex adapters (4 total)
-Associated #9880 Steering blocks
-Jconcepts #3354Y 12mm front/rear 12mm hex wheels

A few questions:
1) The #9883 hex adapters are two sizes. Two are a little thicker. Which ones go in the front and back?
2) The hex adapters from Associated seem a tad big for the 12mm wheels. Will they work themselves in or do I very slightly sand down the adapters to fit in the wheels?
3) OR just call it a day and get the aluminum #9892 and #9893 (front and rear)?

Looks like I need 4/40 nuts (#4449) for the steering block to hold in the ball stud? I plan on racing on dirt/indoor clay. Thx