Now that I see it written here mine are the 4529418. Have to look and see if my calipers are here or if my kid still has them. Might have to wait till tomorrow and I can bring my other one home from work
I got what I thought was a good deal on the 3 on ebay, thought it would be easier to find the rest. But being 60-over, when the machine shop came back and said my block only needed 20-over, I didn't look too hard for the rest of a set. I'm a fan of boring out as least necessary to clean up the bores.
I'd bought the ones I have before I had gotten my block in to the machine shop.