Earthp wrote:PR95, I never saw this front grille with this center Isuzu logo

I'm not sure that's the grille PR95 Geoff thinks it is.
The grille doesn't look wide enough to be the single headlight grille, on 1967 to 1968 Bellett GTs... besides that kind of grille looks like this:

- 1967 Isuzu Bellett GT grille.JPG (383.07 KiB) Viewed 81577 times
What I think you've got there, is the grill badge from the above, single headlight grille (single meaning one at each end, not two at each end!) from 1967 to late 1968....but I think it's been screwed to a late 1968 to 1971 twin-headlight grille... see below:

- Bellett sedan front.jpg (93.32 KiB) Viewed 81577 times
The GT and the sedan had the same grille by the '1969 model' (released late 1968) except the sedan had a 1500 badge seen here, while the Bellett GT1600 had a 'GT' badge.
This late-model grille has chrome bars top and bottom, as well as two sets of twin bars above and below the 1500/GT badge, exactly the same as yours.
It also has three vertical supports holding the chrome bars together; two skinny ones either side and a fat one in the middle; the same thing can be seen in that brochure photo above.
Judging by the shape of your tail light holes, the grille that is supposed to be with the car is the one you can see in the first photo... but it appears it's probably been damaged at some stage and replaced, but whoever fixed it retained the original grille badge to confuse and confound future restoration efforts!
It's like archaeology!
I hope that helps!
Cheers,
Dave