Not sure how it happened, but I lost the front case plug for the main shift rail (coming off of the offset lever in the tailshaft) when I resealed my T5 a couple of months ago. I haven't lost much fluid, but I would like to replace the plug ASAP before I have to find another $200 transmission. Problem is, the trans is still in the car and I don't want to pull it until I have the replacemment plug. Does anyone have their T5 out of their car right now that can take a quick measurement of the OD for the plug? There are 2 of these, the first being on the main shift rail in the top cover and the second being in the main case plugging the reverse/5th shift rail hole in the front (opposite side of the countershaft).

 

Same plug.. 3/4" (0.750) OD

 

Of course, I went to the dealer for these and they don't have a part number for them (small parts kit, I suppose). But they did give me 2 cup plugs, a 1/2" and 9/16". Guess I have to fight the crowds on Saturday when I get out to Lowes.