I'll have to take you guys word for the 3.0 distributor clearing the left duct without modification. All I know is it looked as though the distributor cap and rear clip would have actually made contact with mine if I didn't. I rather like the "luxury" of being able to see the rear clip as I attach the cap and not have any contact with the plug wires against metal ducting.
Hey Dan! I tried all the usual sources, EASY, Parts Heaven, etc. and finally found my set on eBay after about of year of being outbid by every f#@&ing sniper on the planet bidding on Porsche parts! I figured about $200 a set for used metal ones is a decent price considering what new plastic or repro fiberglass ones go for, plus I like things I can weld! The early 2.0 ones were all metal on both sides, the 2.2 and later used plastic on the right side "elbow" that ducts into the shroud.
I appreciate all the positive feedback on my work! I'd suggest having John Walker do the mod for you if you're not equipped to do it yourself.