Any cap that you can figure out how to bolt onto the coil mount and connect the wire would work for a radio cap. However, they really should be tested. First they may be low on capacitance, which reduces their effectiveness. Second they may be "leaky" which means they draw current, and may short. Last caps that old can be prone to shorting, at any rate.
You need someone to test them. You need a high voltage leakage tester to do them right. Steve I would offer to test them (I have a couple of old heathkit cap bridges) but I'm not sure they are worth the cost of shipping to do all that
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Notice the control at top right, "leakage test" and the voltage switch positions. This allows you to test higher voltage rated caps at close to their working voltage
