No holes to mount rear bumper on my frame? What am I missing here?

[traut811]

I need help from the wealth of knowledge on here.

I bought this 67 truck out of California, supposed to be factory short bed. The vin shows a factory short bed, but I can see a z notch I think below the rear of the cab area where it may have been shortened. It had a roll pan before.

I purchased a smoothie rear bumper, and do not see any holes that are supposed to be there for mounting the banners. The slot is there that I see on other people's, just but the main holes. Even the top inside notch towards the back looks right to me. Could the back half of this been cut off? If so, will this cause me any issues other than just feeling new holes? I'm running a wood bed also, so have that rear cross member. The extra hole on top was from me moving the center frame support back 1.25" or so.

Thanks a lot in advance!!