www.RX7fb.com

Anyone know of a source of rear number plate light housings / bulb holders?
Or of another car that will swap directly across?

I tried some FC ones but they're too small, mine are corroded and literally falling apart internally. If I could just find the screw in bulb holder the actual casings are fine, but it looks like a Mazda design and I can't find them anywhere.

All the other stuff online that looks likely never has listed dimensions.

If i am not mistaken, these are the same of a 323 BD-model, 1980-1985.

Perfect, I'll have a looksie.

So they're impossible to find as well.

My solution in the end was to cut down the screw in parts of the bulb holder to just the part that screws in with a little bit of material after the flange, then I used the bulb holders from the FC which are exactly the correct diameter to fit inside the old light fitting.

Plenty of epoxy around the flange where they butt together and then another bead around the edge for maximum strength and they're good.
From the outside they look exactly the same, another bonus is the plugs on the FC light look (slightly) more watertight.

I find silicone grease very useful for a bit of waterproofing these sorts of thingy's.