Yes they do fit, but you end up with excess harness through the fire wall. I bought a RHD from wiring specialties, it’s a good product
I also ordered a RHD loom from Wiring Specialities but got sent a LHD one. After the delay I had experienced getting one I used the LHD loom. everything in engine bay was perfect. As Boll said you end up with excess loom through firewall which is pretty easy to hide.
I had a shitfight that I lost with both Coz (supplier) and WS. I had previously bought a LHD harness, so I knew how much excess there was. For the silver car, I didn't want the excess so I bought a RHD harness. Harness I received was miles too long like a LHD, so I complained. In the end, from pics I sent, they determined that I got what I asked for. The determining factor was where the first branch comes out. Needless to say I was not happy, and make a point to tell anyone that asks about my experience with the WS RHD harness. I ended up moving the firewall grommet and heat shielding and the excess length inside the footwell. I specifically bought the RHD (and paid $100US extra) so I didn't have to stuff around with it.