B body small block Bell question.

I came across some that were early dual bolt 273 or slant six. I'll put the link up on it. But I appreciate the refresher pics and see the error of my ways, I had a dual bolt bellhousing... DOH! Things got fuzzy around the edges there, I apologize. That one was for a 10-1/2 inch clutch, while I also had a cast iron slant six 11 inch clutch HD one in a '73 D-100 (not that it would matter for a car) that had the double bolt as well. I got an light duty aluminum slant six OD one now for 9-1/2 inch clutch that is a single bolt, out of an 85 D-150.