Have a couple AD305 adapters...

[RickBullotta]

If anyone is looking for an SD50->SD300 adapter to attach a display or mode switch to their EP8 powered bike, I have a couple spares now after swapping out to a pure SD300 setup. I'd sell them for what I paid (which was way too much, but I couldn't find them anywhere so had to go to eBay).

 

[ElectricBiscuit]

Those things are gold dust here in the UK, as well as massively overpriced.

The SD300 wires are also crazy expensive.

They are only red/black power wires inside and can be spliced, soldered, and fitted with shrink wrap tubing.