15 x 3 1/2 Keystone Kustomags BBP even SBP

I have a complete set of small bolt pattern and I also have a complete set of Large Bolt pattern with spinner caps. Would like to find a set of standard caps for them and they are different then the modern caps. I am building a 70's Street Freek Style Blown 69 Dart and really want a set of skinny's for the front. I will pay up for a set of skinnys even if 4" wide in a Kustomag style.