I'll post this here as well for reference.

Turns out a JZA80 Supra (maybe 99-00) master cylinder fits, pretty sure the car I got it out of was a turbo model. It's an Aisin part just like the original.

The front of the reservoir comes very close to the strut tower but shouldn't rub too much, if at all. The reservoir is also slanted so there is a lot of fluid at the front and just above the min line at the rear. Not sure if this will be a problem but should be ok.

Picked mine up for the grand total of $35.