I have the same battery in mine, but mine is an orange top, not too sure of the differance. Anyway these are great for car systems, and a 1 Farad Cap. wouldn't go astray either.
Bought mine at:
Battery World
1245A Sydney Rd.,
Fawkner, Vic, 3060
PH:9359 5111
PAID: $310 (with new battery clamps)
Be warned, you will need to modify your battery tray, leads and clamps to fit it. But is well worth the effort!
If you need help to fit it or if you just want to check mine out before buying it, give me a call as i have done mine myself.