I am in the process of restoring individual parts for a 67BB 4spd, 69SB AT and a 70 Boss 4spd. I have a number of cross members with slight differences and am not sure what goes to what. If you look at eB a lot of ad's say everything fits 67-70 so that lessens my trust in the sellers as a whole. I have a few versions, 1. One looks like a standard 67-70 contours but has two maybe 1/4 holes drilled through the center lip
2. Have others with no little holes as above
3. A couple where one side of the cutout goes in further on one side (mounting bolt to body mounting cut out area) and the transmission mount slots in the center are more elongated than on 1 and 2
4. The last one has two frame mounting holes on one side and one on the other- probably fmx/c6 69/70.
I'm more familiar with the 65/66 which are basic but these have me second guessing myself. Can someone shed light on the "visual" differences between the year and applications?