Ok, so they arrived and they look pretty nicely made
Plugged one into the dipped/low beam and worked fine - really bright, easily as bright as my previous GS’s HIDs - haven’t tried the other one to see if the LED emulates the same DLR/High charcateristics of the OEM bulb.
So, the dust cap will have to go - not just because the LED’s heat-sink needs to poke out the back, but the OEM dust caps have the OEM bulb’s wiring in the way too.
It might be a while until I have time, but basically the process (I think) will be a generic rubber ‘boot’ dust cap to replace the OEM plastic one, with a hole cut in it to let the LED bulb’s heat sink poke through. Then just need to connect the LED bulb’s spade connectors to the bike’s ‘bullet’ connections somehow - could strip off the connectors from the stock wiring and just solder/crimp on female spade connections (or work out what size the stock ‘female’ bullet sockets are and fit male bullets to the LED wiring), but I like the idea of keeping to stock connectors and making the LEDs plug-and-play - so maybe a little ‘bridging wire’ with female spades on one end and male bullets the other.
Either way, the bulbs seem great and a mod doesn’t seem hard
I’ll report back whenever I get the time to do more