I recently purchased an Optima with 850CCA but when the guy tested it, it read over 1000CCA!
They looked it up in a book, and said that it would be a good fit, despite the fact that it was a little smaller in dimension.
I just laid it down on its side and it is holding very well.
This is an "acid-free" battery with a 7-year warranty and I paid $120 from a local Batteries Plus. I know NAPA has them also for same price.
Current: '91 300TE 4MATIC 317k and climbing...
'81 300TD Wagon 168K "Tank"
'83 240D 216K 4spd manual "Da Bear" (aka best car ever)
"Never sweat the petty things...
and never pet the sweaty things."