I'm after a couple rubber or PU type bushes to go over the studs protruding from the bottom of the rad?

Any idea where from?

how about a thin slice of rubber hose if you have some left over from building the kitcar?

either from the main dealer for the car that the rad came off

or maybe something like cable entry grommet near the bottom of this page if it's the right size?

Turn some from nylon on your lathe, I can prob find you a chunk if you have an idea of how many etc
atb
Mike

ebay Item number: 220814722093