[markeb01]

If your question means - can the nubs on a 4 bump wheel be polished down a bit to make early hubcaps fit without damage, the answer is they really don't need it. Just take your time to align the irregularities in the hubcap with the best fit over the nubs and they'll work fine. Sometimes they can be pressed in place with heel of the hand pressure.

Always try to have one of the small nubs/bumps be the last one to snap the hubcap over. That way the hubcap doesn't have very far to stretch. Installing over both the small bumps and one big bump first, causes the cap to stretch further to get over the last big bump.

I've runs old caps on 4 bump disc brake wheels for years with no hubcap damage. I've also seen other people bash them in place with a rubber mallet and no finess and either split the edge or smash the face of the hubcaps on the first whack, then blame it on the wheels.