yeah as per title. Where do you get these buggers from?

especially the last one with the ringed groove, its has no PN.
I can get the regular round one from Philippines ,haven't seen them anywhere else yet. look generic anyway.

Pretty sure Vintage has them

also any ideas where to get NOS or nos condition front bumpers? late boxy bumpers.

I already sourced a heap of nos rear bumpers but its the front I really want as its rusted 20 fold over the rear bumper.