Well guys, I ended up taking out the bracket and stretched wider with a car jack + a little bashing with a plank of wood. Took me 20 mins to modify and mount, very snug fit and no paint lost. A worthwhile method to try first before pulling out the angle grinder =) Need bigger terminals now.
I paid $329 at autobarn, needed it asap so no time to shop around. i think its not a bad price for convenience though.
Yeah, i was thinking about that also. My normal heavy duty Diamec battery lasted me a good 7yrs till now. I'll see how long this lasts, and switch back if it doesn't prove any better.