Its been a while but if I remember correctly....

Based on the above pic the grommet on the left looks like the original that came out of my car that was NOT being reproduced when I ordered the part for my car... I used the part on the left ( I believe it was for 68/up) and it worked great with my new tank ( never had a problem).
I did lube up the fill tube when I installed it in the grommet/fuel tank....