Since these are N/A headers I decided I would post them here first. I have a brand new set of Headman headers P/N 68410 which fit the Regal body style. They list them as 81-87 for the Buick V6, 1.5" primaries and 2.5" collecors. Complete with reducers. Only out of the box long enough to see they wouldn't work for my project car. Need to move these so $100 shipped gets them.