1995 Tigershark Monte Carlo

Can anyone tell me what the 2 bladders are for on my Tigershark? It has a 639cc 2 cylinder Suzuki engine. One is attached to the magneto case and the other is located on the impeller drive assembly. I seem to get some oil seepage out of both of these. I'm wondering if I should replace these, but I can't figure out what purpose these do. Thanks to anyone who can answer this for me.