Rear bumper brackets.Need help figuring out what I have

[Tja1161]

Hello,

I have searched and can't find what I need to know. I have an 85 K2500 and when I bought the truck the bumper was given to me uninstalled. So on other threads I saw the dimensions should be 34.03" to rear frame sides. I measured mine and get that size. However, when i went to mount the brackets are roughly 37" so has a gap on both sides. It's fairly rigid so I can't pinch it that tight. I am wondering if brackets and bumper are 73-80. I see LMC has listings for 81-87 and 73-80. Does anyone know what I have here? I read other threads that said rear bumpers interchange but front bumpers are different.
Here are some pictures. I would appreciate anyone with knowledge of this.

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[PrairieDrifter]

From what I've seen, the brackets that go from the bumper to the frame are dead straight, they don't have that kick out like yours do. I couldn't tell you anything past that. That's on pickup bumpers 67-79 that I know of, I would imagine 80-91 are the same.

 

[PrairieDrifter]

Here's the only terrible pic I can dig up, but you should be able to see what I'm saying.

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[bucket]

I believe that's a Ford bumper.

 

[PrairieDrifter]

I believe that's a Ford bumper.

Yep, didn't even pay attention to the outside design.

 

[Tja1161]

Wow. That was not even something I considered but it seems to make sense why it won't line up.

Thanks, Guys!