67-68 vs. 69-72 body mounts PLEASE help!!

[oldgold70c10]

OK,
In a couple of weeks I will be putting a '67 small window cab on my '70 frame, so I figured I'd replace as much stuff as I could while things are apart.
However, looking at http://www.gmcpauls.com/rubber_&_weather_strip_21.htm I see that there are 2 types of cab/core mounts: 67-68 and 69-72. Which should I use???? What are the differences???

[chevymad]

I'm not sure what the difference is, but I just put a 67 cab and 68 radiator support on my 70 frame. I used the early mounts.

[Green Machine]

Cab mounts are the same, but the 69 -72 core mounts are thicker and have a bigger hole, the metal mounts on the frame sit lower to compensate for the thicker rubber. I tried to use 69-72 core mounts on my 68, they won't fit into the hole and sit way too high. I may be wrong but I am pretty sure the core supports mounts need to match the frame year , not the core support year.