So I found a couple of fixtures on eBay, like a Joslyn incandescent NEMA head and a incandescent Westinghouse NEMA head. So I was thinking of this, and to actually make a remote ballast system for a incandescent NEMA head. Like 175w Mercury Vapor or Metal Halide or 100w HPS remote gear for these NEMA heads. Since now high wattage incandescent bulbs are now hard to find.

Here are the fixtures that I found on eBay. They're quite expensive, but If I do find these or one of these fixtures at a restore, it would be cheaper. 

https://www.ebay.com/itm/Vintage-JOSLYN-60s-Incandescent-Street-Light-Refractor-Industrial-Outside-Decor/253883626057?hash=item3b1ca4b249:g:RZEAAOSw07lbkC36

https://www.ebay.com/itm/Vintage-1960s-Westinghouse-Incandescent-Street-Light-NOS/173532192925?hash=item286753209d:g:cWAAAOSw5WVbdgG2