The slant 6 K frame is basically the same as the V8 on the driver's side (we're talkin' the '67-'72 biscuit mount type here) with the truck bracket and thick truck rubber mount making up the difference in height on the passenger side. You can also use a passcar mount with a piece of box tubing (I forget if it's 2 or 3" tubing) to make up the difference- a 3-4" chunk of tubing, drill appropriately placed holes on opposite sides, bolt it to the K frame mount and drop the rubber isolator stud into the top hole.