The "adapters" that my optimas came with are grey. I think i have a few sets lying around if you cant find some.
I used to have good luck with optimas, but not lately. I do a lot with boats, and they used to last good in boats. Now they seem to suck for some reason.
The last 2 I had in my truck were put in ~Jan of 08. One of them was trash about 3 months ago, so I just replaced it with an everstart from wal-mart. I warrantied the optima for a new one, but I will just put it in the boat or something. I probably wont run optimas again after both of these two bite the dust.