@Popee posted:Car is 8 years young with 1200 miles.
Respectfully, that's irrelevant. The thing about a T1 VW is that at this point, almost all of them are built either partially or entirely aftermarket parts, which is why the numbers on the case don't mean anything, nor can anybody (but you) be sure of what size spark-plugs are in it.
You have to know what you have. You aren't going to be able to go to any SN decoder website to tell you that you've got an AS41 case with a DPR stroked crank, 5.4 I-beam rods, a Web 120 cam, Engle lifters, and CB044 oval-port heads. Posting pictures here would help us help yourself, but don't expect a miracle.
Build sheets are invaluable.
With that said, almost all aftermarket VW heads built in the last 20- 30 years are "12 mm long-reach" threads, which use an 18 mm socket. I think there are a few VW Mexico (aftermarket) heads that used 14 mm plugs, but CBs, etc. were almost universally 12 mm. If I were betting, I'd bet you need an 18 mm socket. You can get an endoscope, but you're going to be doing this blind anyhow. I'd just get the socket, and a short extension, and give it a try. If it fits - yay!
If not, then back to the drawing board you go.