Fuel filler grommet question for oddball CA '70

[dflarsen77]

My '70 C10 has EEC, thanks to the no-fun laws of CA, it's apparently a year early from everyone else. So I'm in the process of replacing my gas tank. The one in it has no vent provisions, and I don't want to run a vented cap, and I don't want to switch to a rear tank right now, so I got a EEC tank from LMC. Well it's pretty lousy. It looks nice...



It takes quite a bit of tension to get it up on the mounts in a somewhat lined-up fashion. But once it is, the filler neck sit's way up at the top of the hole.



I figured that might not be a deal breaker, as I might be able to bend the neck down at the ribbed part and hopefully not break it at the seam to the tank. Although I really don't know if that's possible, and I don't want to try yet. But then I put the grommet on and it's waaaay to big.



I got it from LMC with the tank, and it's listed for 67-70, which made me leary, but it says it's a 2" hole, and the page for the tanks says both of the EEC & non EEC tanks are 2". Made sense to me. But the grommet I took off the truck might be original (has the original color sprayed on it), and it looks like the 71-72 style, which would fit the 71-72 style EEC system.



The LMC grommet hole is like 2 1/16" wide, but the one from the truck is ~1 15/16 (it's pretty stretched out). The neck on the tank in the truck is 1 15/16, but the LMC tank neck is 1 7/8.

So can anyone tell me for sure? It seems pretty obvious that whatever tank I get, if it's EEC or not, I need the 71-72 grommet, and if it's too tight, I can trim some off. It also seems like I should get one of the american made grommets from GMC Pauls.