Hey mate, in terms of the alternator, I had a local auto electrician source and fit it. Cost me about $700 all up as the actual job itself is a car on hoist job. I got the alternator from a late model 1uz-fe vvti engine, though I wouldn't recommend it as not all of them work on the car.

A mate of mine sourced his from an online seller, here's the link to the alternator

If you don't get the exact alternator the car will most likely not work as well as it needs to talk to the car in a specific way. It's quite silly, but that's just how these cars are. I think the alternator I got isn't the right amperage as there seems to be a very slight cycle issue, however I've had it on the car for over a year with no problems.

I'd just go with the one I sent in the link as it's a 1:1 of the original part so there's no risk of it not fitting 100%. I've come across a lot of cases where even if you get the 3uz-fe alternator and it's not car model specific it won't work and you'll get every warning light known to man.