Sway bar diameter question
 

I'm getting ready to order new sway bar bushes and drop links for my 79' SC. It's stock as far as I can tell. I put a caliper on the front and rear sway bars to make sure and get the correct sizes and I get a 21+mm reading on the front and 18+mm for the rear. I was sure that I had read that 20mm was stock in the front and this is probably a silly question but when ordering my bushes should I be looking for 21mm or 20mm for the front? I appreciate any advice.

My '77 has 20mm front and 18mm rear bushings FWIW

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The oe spec for a '79 SC is 20/18

This was the same for Carrera 3.0 and SC from '76 thru '83
and for carrera in '84 & '85
for '86 they went to 22/21

Just a tip that the correct pn for the rear 18mm bushing seems to be way undersized. I ordered bushings 477-411-313-C which is for a '85 Turbo 20mm rear sway bar and they fit my 18mm bar perfectly (78 SC).

http://forums.pelicanparts.com/porsche-911-technical-forum/888527-question-about-rear-stock-sway-bar-bushings-sc.html