Depending on condition it may be best to reco your old one, so perhaps get a couple of quotes from different alternator specialists in your area.
 
S/H alternators can be a bit of a lottery and I suppose you know that if you're looking for a S/H one, the NA and turbo ones are different sizes, and the NA one wont fit your turbo mounting bracket.
They are different power ratings as well, and the early ones had a round connector while the later ones had an oval connector that will probably be the case with the one on your motor.

So got the Alt out and had it tested and its definitely a dud... What I cant confirm is - Amp, part number and is it a NA Alt.... Can anyone confirm?
 
See pics attached

Hi, how did you eventually remove the alternator?  I'd seen pull it out the top but this seemed to be for N/A.  Did you really have to remove the exhaust and the cross-member?  The Toyota manual shows nice pics of the alternator being replaced with the engine out of the car!  Sounds like a Toyota engineer must have been on holidays when they designed this.  Thanks

Hey mate. I dropped it via the bottom. Key is to lower the crossmember. No need to remove just undo the bolts and that will give you enough room. I also had to disconnect my BPipe (leaving it where it is but just moving it to the side) but i do have an aftermarket Berk Exhaust.   Its a bit of a pain but you can do it. 

Thanks for the tips.  Yep, my alternator is sitting quite happily on top of the cross-member.  I considered adding an inspection plate in the engine bay wall to the trunk to give me access but not enough trunk wall in the right place.  I know, what a cowboy:-)
 
I dream about chopping the last 50cm off the back of the car and remove the trunk and make the trunk firewall removable.  Much better engine access and ideally I could sit the engine on a frame/base, disconnect the various crap and then wheel the car away, leaving the engine on the frame/base.  This was how I was able to work on the engine of my rear-engined Hillman Imp in the 1970s.  I think that the car would look pretty good with a squared-off tail just behind the wheel arches.  I'm now getting ready to be flamed for my 1970s fashion sense:-(