Some good news, just picked up Rossco's old alt and I'm 99.99% hopeful after measuring it will fit, bolt out, bolt in :-) Hole measurements spacings are identical The only difference looks like the GQTD42 alt vac pump protudes a further 15mm max.
Thanks for the 170a ebay link Phil, I'm biting the bullet and maxing the M/C now ;-)


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