if anyone wants to know what amp alternator they have just look for a stamp or plate on the housing (usually in a hard to see spot). will tell you the brand and amps
i found an outfit in the states (
www.alternatorparts.com) that can build custom alts to suit your particular power requirements. they do however suggest a dual rectifier system (which they supply) as the built in Denso rectifiers arent beefy enough. i was going to buy a mean green unit until i learned of the rectifier issue so will one day order up a 150-200amp custom unit. price is comparable.
so far im getting along ok on the stock unit running driving lights, spotties, 7 cooling fans, uhf and a high power dual amp stereo but i can see the day is coming for another upgrade