SV91 was the first HSV with plastic RIM bumpers that werent a carryover from Holden. It was also one the first VP HSV models (Club Sport was released at the same time)
The last one I saw for sale was cut into a ute and the one before that was a factory white one that someone on here bought.
I wouldnt be worried about 300,000km if its looked after. The old 304 is easy to freshen up.