Thanks,
@newold_m ! I have a feeling (from the kind gent who steered me towards the Focals) that we can just reuse/modify the old grills from the OEM 8" -- but that will be a piece of the puzzle.
Looking at that link you posted, it says the hole is cut for a 5.5" speaker...so I doubt that those would work -- but it says
"Standard cutout diameter is 5.5″ but we can change this to whatever you need, just ask." Did you try phoning them as well? Again, a lot of people buy inexpensive 6.5" speakers to drop in there and zip-tie them into the cages -- but I want as much big boom as possible (LOL)!
Apparently the speakers are on their way. I asked a rep at WoofersEtc about the crossover yesterday, and they seemed to confirm that the crossover (capacitor) is already inline with the tweeter, which should make things easy. Apparently we just remove the original tweeter in the dash (front L and R) and those should have the crossover already there. In turn, we just replace the tweeters that come with the 8" (wire them to the 4" in parallel), and we're good to go. Apparently the 4"is a direct fit.
Fingers crossed here!