Please help identify these trucks

They are the trucks with mounting brackets for a Lionel hopper car

These seem to be K-line roller-bearing trucks that were riveted to a freight car of some type. So, K-line is in the recent past of model trains and they are for a more modern freight car as they are of the roller-bearing type, although they aren't a particularly good representation.

Thank you, gentlemen. From what era are they from? At least now I know what they are so if I take them to a show, I can represent them accurately. It doesn't sound like they're particularly desirable, nor rare. They roll well, at least that's a plus. What do you think they're worth?

I believe, from the limited view of the truck sides, that they are Lionel MPC-era Symington-Wayne trucks.  They are of negligible value but would come in handy to someone who has a hopper in need of trucks & wheels.

Specifically, with the metal bracket they are from early MPC quad hoppers, from around 1970-76. like the 9110 B&O. from then on the brackets were made of plastic and snapped in without a screw.

Chuck has it right. I believe the assembly number is 9110-25, or 600-9110-025 in the current parts syntax.

TRW

Not fair!  I was the first to reply and provided the correct answer within an hour of the original post and someone else gets the credit? No way to end the year.  Going to play with my trains now...

P.S.  No disrespect to Chuck who provides immeasurable value to this Forum

As mentioned earlier, thanks so much for everyone chiming in. The amount of knowledgable people on this Forum have is astounding!