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I have an RC12L that is missing the rear diff hub. I see original examples for sale on eBay but they have the two hole wheel mounts. My question is: can I swap out the RC12L hub with one for an 12l4 or are they too different?

the old 12L is using a 2 holes hub to mount the rim, while the modern 12L4 / 12R are using 3 holes hub. They are totally different and not inter-changeable.

Thanks. I've done a bit of homework since posting this question. The 12l diff hub isn't drilled. The diff-side wheel is held in place via friction fit. The hub on the other side can be replaced with a friction fit hub so that it can accept newer 3 hole wheels. Of course, until I take all of the parts off of my other cars and test it, this is all theory...

I got it to work in the past, but you have to swap everything including axle, rings and both hubs.

Got them. Thanks.

the 12L3 or 12L4 rear axle assm. will work in a 12L I have most of my cars done that way.