Hi gibbo, i only photocopied one large long page out of a VT Series II "14E" supplement / workshop manual. The pages were about the size of three A4 pages joined together. I used to know someone at a dealership (who has since left) who gave me access and let me photocopy the one large page i wanted which was all i needed to get this mod to work. There was only one page covering the PRND321 lights specifically so i didn't photocopy anything else.
I've stuck together the three A4 sheets as one large page and took some pics of it on my digital camera. I don't know if these will be readable once posted on this forum. If they're not send me a PM and we can discuss alternative arrangements.
If you know someone at a Holden Dealership well (who can get you access to their manuals etc) you could ask them. Or if you have some spare $$ and want to buy one yourself, they were still available in late-2007 thru Holden Spare Parts. The workshop manual details as follows:
Commodore VT 1997-2000 Workshop Manual, Volume 14E -Series II Wiring Diagrams
part number 92142412 cost $190.00
In case it helps, i've also attached a pic of the 4-pin PRND321 transmission plug which i managed to "find" at a wreckers one day. I still haven't bothered (and probably won't bother) to use it to replace my custom wiring job (that i discussed in Post #7) as it's still working 100%.