Nissan has part numbers 22020-58501 and -58511 being for the 90-93 and 22020-97E00, -97E10 and -97E11 for the 93-96TT. Will the PTU's for a 93-96 work on a '92TT, and what is the electrical difference in these parts? The 93-96 parts cost quite a but more. These things are all expensive...I'm thinking of building one and a few spares up out of discretes.