Hello,

Below is a picture of where my new radiator will be mounted (that old condenser will be replaced). I'm not sure how I should mount it on the bottom. The vendor (Griffin) said to run a strip of weather stripping underneath, but I feel like that would be too soft and may be prone to deterioration with the heat cycles. I know some vendors sell some hard rubber type pads, but I don't quite understand how it would hold the radiator in place on the bottom. The second picture is the type radiator I have.

That's all you need, a strip of weatherstrip and a couple of tabs to keep it from sliding back and forth,really doesn't need much to keep them in place.

I took a sandpaper holder that is made out of, looks like rubber , one that you wrap the sandpaper around, cut it to fit the bottom of the Radiator then drilled a couple holes
in the ends, bolted it down. Now the bottom of the radiator is just trapped in that piece, it can't move back and forth. Did something similar to the top, but
bent some aluminum and put some screws here and there, Radiator is now mounted in rubber mounts that are a little forgiving.

That's interesting. Anyone have pictures of their custom made setups?

Anyone have some pictures of their radiator mount setups? I'm looking for something like a radiator mounted to a core support in an older car.

The original probably had a U shaped molded rubber isolator at the bottom.
I bought some rubber spring spacers at the auto parts store and cut my own with a bandsaw.
You can use the original upper style support or a couple metal straps with weather srtipping cushion too.
Be sure the aluminum radiator is not contacting the metal support, brackets, etc.
Sorry, no pics.

I made brackets and bolted it to each side of the core support and welded threaded inserts to the tanks. Welded aluminum angle to the top and bottom of the radiator to mount the A/C condenser.

After reading some of the comments I've been mulling this over for several days. I'm most likely going to have to use some of the advice and make my own mounts.

Basically, the setup as above means a radiator should be "cradled" on the bottom, and "clamped down" from above. Don't overthink it.