The rear boards appear to be steel chromed RIVCO version, which also sold the Chromed alloy ones. The big advantage of these RIVCO designs is the available extension to bring them fwd for even more pillion leg room.
The RIVCO ones are out of production now but you can fit a few other options:
There is another aftermarket extension version available. too. You can also fit a number of different rear foot boards from Kuryakyn with or without the stock peg mounts and splined adapters.
The ultimate strong rear footboards actually come from the R3Touring (and shared by a few other Triumph models over the years), which will bolt straight up to dual headlight R3s AFTER you remove the Chrome or Black peg mount bracket frame covers #10/#11. This exposes a second bolt mount hole that is the exact width from the single peg mount hole to allow bolting on the R3Touring rear footboards. With a little shimming and drilling a 2nd hole in the Chrome/Black frame covers it should be possible to re-fit them too.
Dual headlight rear pillion pegs,
note use of the rear hole in rear pillion peg bracket frame in 2nd image below
Dual headlight frame note 2 holes in rear pillion peg bracket
R3Touring rear footboards.
The identical L & R brackets #5 mount directly to the Dual headlight footpeg frame above.
Yes theses are the ones.