I am working on a couple of d6's with a 318 in them. wondering if anyone had number for the fan belt. 7B-2774 is available from cat but at 170.00 it's a little steep. was hoping to cross it to gates or something els. it would be a D size and being ribbed should make is a X . DX61 ? it's 1.25 wide and 60.50 long.