I have a new kit that has the two solid bolts and then the two funky rubber deals that have a smaller bolt that threads into the rubber deal that has a nut buried in them. Which way do these funky rubber deals mount in the support frame? Does the larger diameter of the piece stay on the front of the support or in the engine bay side?

Picture of the kit

http://i.ebayimg.com/22/!CCnnHCgB2k~$(KGrHqV,!lkEz+z++YFlBNLvpnLDgw~~_12.JPG

The rubber flange goes towards the motor and separates the rad flange from the core support.

Good info to know, glad you asked the question because I got these also and was wondering the same thing, but now I know... thanks all!!

It's to allow the radiator to expand sideways as it heats up. As it's made out up copper and brass, it actually expands quite a bit.

Later designs capture the radiator at the bottom with rubber cushions and at the top leaving the sides free to expand and contract.

I am still confused as to how it is attached. So which way do I feed the bolt in? It seems on my car that the plugs were fubared long ago since there are nuts on the outside with washers that all sort of crush everything together. Is there a picture somewhere that shows how they are inserted and bolted down?

When the bolt goes into the well nut, it expands it on the opposite side.

Aweome! big thanks!