B42-500 Magmotors do infact exist. They are just known as BFA42-500 or BA42-500 instead.

See here - http://www.magmotor.com/brushless/bfa-ba42.pdfhttp://www.magmotor.com/brushless/bfa-ba42.pdf

I have also been asked to remind Liam he is in http://z10.invisionfree.com/Drowning_City_Forums/index.php?act=idxthis.