Center drag link, are they really $600? 1964 dart

I've seen 2 "center sump" SB pans, the difference is how close to the front lip is the sump. the 392 pan the sump front edge is 4" rearward from the very front of the pan and the 876 is 2" and the 876 takes a pickup with a long slender bend & the 392 takes the one with pretty much a right angle. I know the 392 fits/not sure about the 876 if the sump hits the rear edge of the kmember.