Yeah, I’ve seen those. They are very cool, and open up some choices!Congrats!
I have a set of Gibson P90s I'm willing to part with if you want to go with Gibson. I personally like a hot bridge P90, but I play hard rock and metal with it. For that I recommend the SD Custom P90 that was recommended to me by @syscokid and he wasn't wrong.
As for mounting the P90s, I looked up pics of a '68 Special and it looks like the original P90s would have been mounted to the pick guard by those screws off each end of the pickups.
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For that you need special mounting brackets like these. In fact you may want to go ahead and grab a couple because the last time I looked for some there were none to be found.
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P90 American Deluxe Mini Humbucker Mounting Bracket Plates-P
www.eyguitarmusic.com
So does mounting plates, for body mounting(instead of pickguard). Like the ones found in plenty of modern Gibsons. There are a few on the market…readily found. From “straight bar” types, to direct rips of the Gibson flat plates..
From eBay to Amazon…and reputable music equipment dealers.


Hope I didn't step on anyone's toes when I made my comments.