Wrong Crossmember??

[01somta]

I bought a complete tko 600 setup and I am pretty sure that I may have got the wrong crossmember. I measured from the inside of one of the mounting tab to the other inside of the other tab and it was 30 1/4". The problem is that from the inside to inside of the frame where the crossmember mounts is around 28 7/8". I'm just making sure I am looking at this right before I bother Frank. Or if anybody can get me a measurement of their tko crossmember on their first gen camaro that would be great. Here are some pics.