From what I've seen from the specs of the HPI Baja 5B rear hexes, all that is needed is a small sleeve with an 8 mm I.D, 2.35 mm wall and 12.7 mm O.D. The hole for the pin would have to be drilled to 4 mm diam. on the LST's axles and then Baja 5B rear hexes could be installed on the LST to run Baja 5B rear wheels and tires all around. But I don't know if the hole of the hex would line up with the hole of the axle. So who's gonna do it
I won't. I have a bin full of many tires and wheels all with 17 mm hexes. When I use up all of them then I might look into other options.