Your probably going to predict what I'm going to suggest but...
Why not just use the one from the black GTP meanwhile so you'll have the car to drive w/ the NIC. It was good enough for you when you were driving it back then I'm sure it still has some life left obvious don't drive it like you stole it and hopefully it will last for awhile longer
Then since you'll basically have a core trans have it built overtime when you can afford it. Buy the upgraded parts overtime so it won't be a huge dent in your wallet all at one point in time.
And kind of the reason why certain items I don't buy used because you never really no the condition of it until you really have someone look it over
