Dave is spot on, but there is more than that.
The model code for a Dandenong HT GTS350 is HT81837. 81837TR is the Pagewood code.
A Dandenong BODY number at this time takes the form 13565M, not HT13563M.
The PSN shown is actually H513563, which is from a Dandenong HK as Rob says.
Harry Firth muddled these 4 cars up well, I think it is well known Bob Morris crashed the Des West car that had been promised to the Parretts but what they got was probably one of the other cars, or even one of the other cars re-bodied hence maybe why it is sporting an Elizabeth chassis number. I'll try and find what chassis number was on the car that the Parretts got from Harry.
The HT chassis number is I think close to what could have been on another Elizabeth body be it a wreck or a replacement shell, and in that era an Elizabeth body with that chassis number the PSN could be L135xxx. So it is possible it was rebodied with an Elizabeth body off another Monaro wearing HT13565A (replacement new shell) or a shell off a wreck with that chasiss number and a VIN plate reading 8xx37TL135xxx, and the VIN plate altered plus a Pagewood tag modified as we see it now. That chassis stamping isn't original though, but as Rob says it has been re-bodied twice. So who knows!
HDT had the 4 original Tonawanda GTS350 engines plus I think 3 from Flint supplied by GM for the Bathurst cars. But what engine ended up in which car and when is not known for certain plus Harry had I think Ian Tate build some engines (presumably from some of the original Tonawanda production engines) and one was buggered by GM on the dyno. We do know that the Woelders/Macrow car had the most powerful engine (and race rubber), then the West/Brock car had the next most powerful engine followed by the Bond/Roberts car.
It is entirely possible to end up with a car with an Elizabeth BODY plate and Elizabeth chassis number but with a Dandenong or Pagewood VIN plate - this was normal for HT vans, but very rare for anything else. This plate combination PLUS the fact they all match is impossible.
Edited by yel327, 27 September 2019 - 06:47 AM.