[Mr70]

The Y77 had 3/8" & 5/16" side terminals along w/a 45 amp hour rating and 2300 cold cranking watts and weighed 34lbs.
The Y89 had both 3/8" side terminals along w/a 61 ahr,and 2600 ccw. and weighed 44lbs.

The Y89 is a little larger,but will fit in the same tray.
They both had std. terminal positions,but you're gonna have to adapt a battery cable post to accomadate one or the other.