Yes and this was the issue another member had. He was even sent one that wasn't correct. VS V6 is the odd one out. For some reason VR V6 are still quite readily available. What i remember IIRC also is that the OP in the other thread was looking at possibly fitting a VT rail, because of how scarce the VS V6 ones are.
Or maybe you could ream out the fuel rail to take the VN-VR regulator (if you have a 95/96 VS with 3 bar).
Anyway, I spotted on Autobarn website: Bosch 028016552 regulator, but when I went to a store, they said none in stock, and have no idea how long you would have to wait for an order. These things also appear on UK and Italian websites, so perhaps they were used in some obscure European car, which didn't sell well, so there aren't many on shelves.
The VN-VR regulators are still freely available - presumably tons of Buick/Chevs had them, so they are stll being made.
Then looked up Fuelmiser catalogue. They list their FPR-161 as being the one for V6 VS 95-97. But the price! Anywhere from $200-$300 from various vendors.
The Fuelmiser regulator for V8 petrol Landcruiser looks very similar, but they are only around $60....