LOL - I lost mine about two weeks ago. My "temporary" one came from Autozone...although we had to open about 15 different ones until we found one that "worked". That crappy little plastic one that came with the valve-cover is (was?) worthless. I'm also interested if you find a good replacement, considering the oil hole is perfectly round with no catches to hold one in there properly.
1986 CJ-7, new I-6 258ci (4.2L), T-5 tranny, etc. etc. etc.