Working on vacuum leaks would like to know the size of the o-ring for large metal line at the bottom of the throttle body. Did a check with smoke and had some smoke leaking from that line. Any help would be great. Did a search no information was available.

P22 Parts book...
3.336 O-ring, vacuum tube PN 10039067

There's nothing special about it though.
You can take it out and match it up to a regular black o-ring (most likely a metric size)

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Thanks a bunch. Will try that.

just replaced mine ) i got a box of metric orings from harbor frieght, alot of people forger to replace that one along with the line under the plentum, replace those plastic line with the stainless metal ones , you would be surprised how brittle the are

I did that but the car was down. Ready to get it back on the road if all the vacuum leaks are sealed.

I just sent an O-ring to a fellow club member. The inside diameter of the ring is 0.543 inches and the thickness of the ring is 0.10 inches.