I need a trailer roller arm mount thing, i clearly have no idea what this part is called and thus I'm having no luck finding one. Maybe the picture helps someone point me in the right direction!

If it matters, this is the trailer. I paid $600 for it, so I'm ok with replacing bearings, rollers, and tires.

If it matters, this is the trailer. I paid $600 for it, so I'm ok with replacing bearings, rollers, and tires.