If you plug the vehicle specific info into the Napa Parts Pro SE down-select, it will give you the correct freeze plug diameter, which hole to put it in, and will be the correct match as far as heater element length and curvature goes. I know what you mean tho, you're pretty much committed as soon as the old freeze plug is punched in. I was kinda nervous doing the truck a few nights before a long road trip but it ended up being the correct one. Shoulda gone thru the wheelwell tho to get to it instead of working between the frame rail & block with a mirror. Doh! -- next time I'll think it thru a bit more thoroughly.
gale
92 735i 5-spd, turbo project finally underway!
I was actually on the way to pick up my car that day... LOL.