SOLD !
Just measured it out, looks like 13.5" Had to measure across the padding which probably added some in that I had to arch the measuring tape. But probably 13.5" is accurate enough.
It's a real nice size for a small car, was in my Porsche 914 but the buyer wanted the original wheel instead.
I sold the hub after I sold the car. I have another Porsche hub, solid aluminum (not the cheesy metal with the rubber accordian-style cover version,) in black krinkle finish that looks new. The 6 small holes on the steering wheel are about 1/32 off with regards to this adapter and would just need to be indexed (or just enlarged a smidge) to line up correctly. No big deal, but might be an issue for some folks.
This, or just pick up the MOMO adapter for whatever application you need.
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