VX 220 - exchange alternator?

[apprentice]

Vauxhall dealers are quoting in excess of £500 for a new alternator (VX220 NA 2000(X)) but £175 for an exchange unit for Astra/Vectra 2.2... but suggest it's not compatible with the VX220.

Firstly - is that correct?

Secondly - what other options do I have?

Thanks
apprentice

(NB - also posted on vx2220.org forum)

[apprentice]

Thanks Matt nice idea,

Unfortunately the Turbo alternator is not compatible with the Z22SE engine fitted on the NA VX220

apprentice