Well, looking through my handy dandy Anemone FAQ (I think I picked it up on this site), it lists the following anemonies that are known to host ocellaris in the wild:
For your GSM:
E. Quadricolor (Bubble tip)
For your Ocellaris:
H. Magnifica (magnificent anemone)
S. Gigantia (carpet anemone)
S. Mertensii (Merten's, or spotted-base carpet anemone)
I'm not familiar with the last one by the way. I was kind of surprised not to see ocellaris listed for bubble tips, since most clowns seem to host these. Of course, like I said, this is what's seen in the wild. I also know I've heard of maroons hosting long tentacle (not listed for either species) as well as carpet. Anyway, just as there's no guarantee your fish will host one of these, it may very well host one not on the list. These should theoretically be your best bet, though.