There is a new aluminum style in parts.I think its 275.Looks like oe style and they are supposed to work good.Guy on Ebay sells them also.Cross flows are a tough fit in the early B bodys because every thing is in the way.I had about 5 or 6 early rads in the garage.My kids scrapped them.Man was I POed.I did buy a spare BB one out of my buddys 64 when he went BeCool.That was over a grand for the complete setup.Rocky