Bill, they're not even close. '75 and '76 take a 15-6116 Delco and a 200040 Modine. Both are good numbers and available. The '77 thru '89 Caddy takes a 15-6355 Delco. In '77 GM downsized all there full size models and knocked about 1500 lbs off of them. That '... Login to read more.