I'm swapping out a 4.3L in my '99 NBS Silverado for a 5.3L from a 2000 Silverado. I got the engine and frame mounts from the 2000; the passenger side frame mount swaps fine but the 2000 driver's side mount doesn't look anything like the '99. Anybody know what it'll take to get the 5.3L bolted up to my '99?