Powerlite offer model 401 for the 6 cylinder Bristol which is 1KW, 4Kg and positive or negative earth. About £250. Also 531 which is 1.3KW, 2.4Kg and negative earth only. About £360. Unlike the 401 it has a cowl around the pinion per the original Lucas unit. I wonder what the difference is that makes it around half the weight.
The Wosp LMS037 is similar to the Powerlite 401 but more powerful at 1.4KW. 3.7Kg, positive or negative earth with no cowl.
I bought a Wosp unit from JP Racing for about £240 but am waiting until I have time to fit a new ring gear so can't yet comment on how good it is.
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