I acquired the Sparx switchgear, right hand from a US seller on EBay and the left from Hawkshaw Motocycles in the UK. IIRC, there were three UK sellers listing the parts, all at 60 pounds each plus shipping.
I haven't used either side yet, but the appearance is excellent, matte black is a good match to OEM master cylinder, etc.
Functionality seems identical except the kill switch only goes one way vice the "kill" action going both ways on the original MKIII switch.
Wish I could tell you about electrical connections and quality/longevity of the switching, but my bike is still mostly in bits.