Hi, I always believed that these "quick lock" holders were universal and used mainly for the No.19 set and Chorehorse generator. Wireless set in the right front (above the seat) and generator in the left rear position. But could be also in a different way, possibly also with the No.18 set.
Attached pics of the holders on my Mk.III.
Also the fillers of the fuel tank are on the late Mk.IIs and Mk.IIIs designed on the opposite way as mentioned.
Just my thoughts hope it helps a bit.
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UCw Mk.III
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