Hi. I have an AEL ballast and socket assembly (one integrated piece) that fits an AEL NEMA pendant head. I believe that this assembly will mount into other brand pendant heads. As I recall it was 70W HPS. I can look for part numbers or send pictures if anyone is interested.
I repurposed the fixture and changed out the assembly. Doing some 2015 housekeeping and was going to offer the old "guts" for the price of postage before tossing it out, just in case anyone could use it.
Please PM if interested or you want more info.
I also have an extra Joslyn gumball refractor (glass only) available for trade. It seems to also fit some LM reflectors. I can post precise dimensions.
Thanks and happy 2015.