If you're serious about this, you can find a grill from Australia (maybe on the Australian eBay). They used round lights. It seems to have gone under the name "LUV" and "Holden Rodeo", Isuzu KB, etc. You will have to be careful you don't get one that's for a 1st-gen LUV. Here's
an example, although they won't ship this one anywhere--it's local pickup only. You would also need to get the round headlight buckets.
Jack
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'83 Isuzu P'up Diesel LS - Original Owner
JoeIsuzu@IsuzuPup.comIsuzuPup.com