Just an FYI. You can use stock trx450r mounts to replace the front ones.
Thanks for the hint. I checked to see if those were the ones I had found on this frame. They look identical to the 450r nubbins but have a smaller diameter hole instead of the 12mm hole the 450r nubbins have. So the 450's will work perfect but the one with the smaller hole works better on worn out frames missing 1/2 the bar they sit on. 450r nubbin in center

The new ones from TM design look and work totally freaking awesome. Might have to get a set for the new build. You use a C clamp to press them on, those suckers will never come off!