Hey man. I was just working on replying to you.
In your dash are what we called "Ford 5" 3-hole" speakers back when this size was used. In the rear side panels are 6" x 8" speakers. Both of these sizes were Ford-only size and mounting.
On the dash speakers, it is possible to make 3", 3 1/2" or 4" speakers fit, rigged into the 3-holer mounting. Depth can be an issue, and in my opinion, the smaller adapted speakers never did (or do) sound as good as the larger OEM size. I did a little googling this morning, and it appears that you're not going to find any new exact direct replacement speakers.
Here is a TRS thread from 2008 on the subject:
https://www.therangerstation.com/forums/index.php?threads/front-speakers-not-3-1-2-what-are-they.12634/
On the 6" x 8" in the rear, it looks like this size may still be available in some aftermarket brands, but the ones I see on the internet look like "hybrids", in that they're a little smaller and have extra mounting ears so that they can cover both the Ford 6x8 and the old Chrysler 5" x 7" "football" speaker size.
I'd have to dig through some old manuals, but 1985 may have been the first year Premium Sound was offered in the Ranger and Bronco II. It was first year of the single-DIN radio chassis ('84 had the old "3 hole" radios). It appears that the Premium Sound (PS) amp was mounted below the center of the dash, and only amplified the rear speakers. I'm pretty sure I remember working on some of these trucks new, as I remember the PS-equipped trucks using the 1983 metal upper dash panel, with the three speaker plates. On these the dash speakers were in the corners and the amp was mounted in the center hole beneath a smooth blank plate ('83 AM trucks mounted a single 6x8 here). Is your truck set up like this?
Bluetooth, I just don't know, but I'm sure that others here may be able to answer that one.
Be on the lookout for a PM from me.