Radiator Rubber Pad Thickness

[Y-Blockhead]

I pulled my radiator out today due to a crack along the seam of the top tank and took it to the shop for a "Tune Up"..

While waiting for the radiator shop to do their thing I'm collecting parts for the reinstall.

I noticed the rubber radiator pads that were installed are flattened, brittle and hard as a rock. I ordered new pads but of coarse they are not the same as the ones that were in the car. And who's to say the ones that were in there are correct. Does anyone know the proper thickness (or an educated guess) of the stock pad thickness?

Thanks,