When my BST CF wheels arrived some months ago, the front wheel spacers had been scratched due to improper packing (but still serviceable). I notified BST, and they mailed me new spacers free of charge (but by slow regular mail). I finally got the new spacers... BST machines it's own parts, and the 2 front wheel spacer are exactly identical side to side (no left and right). BST front wheel spacers are a press fit.