'67 Barracuda Bolt Pattern

I carry one of these in my glove box to check patterns.
http://cgi.ebay.com/ebaymotors/Bolt...Z170444098805QQptZMotorsQ5fAutomotiveQ5fTools

There is not a 4 inch on the tool but if you look at the 100mm and then 4 inch will be just a little smaller.
BTW, this gauge is way overpriced here. I gave $7.00 new for mine at a swapmeet.

This link shows you how to measure the patterns.
http://adaptitusa.com/boltpatternguide.aspx