[FStephenMasek]

I've used the 'GSm-Tuner' reproduction grommets from renovated radios: http://www.renovatedradios.com/parts.html#rubber

Note that each one is only 1/2 the support for each screw (one on the top and bottom). So for 3 screws you'll need 6. Not cheap, but they work well.

I have those, but they are too short, so the tuning assembly flops about.  Iis interesting that they worked for you.