I have a 1966 Fender P bass however I think any passive Fender P. will work. I use Rotosound Jazz bass Rs77Ld flatwound strings (same as what Deacon used-they feel great and are even from a tonal perspective and are quite bright). I previously used Ampeg heads & Cabs however back in 2008, I purchased an Acoustic 370 head and an Acoustic 406 wide cab. This cab has 2 original Eminence 15" speakers and is ported in the middle.
If you look at the video for "Crazy Little Thing called Love" it appears to be the the same cab. The 15" speakers give the bass a larger sound than 4 10's and 1x 15 that i previously used with the Ampeg setup. I have owned the the 370 since 2008 with no issues at all and is crazy loud - I keep volume at 2
but i should mention I only use it at home. I always keep the bright switch on for the mid range boost.
Having said all of this, the strings and the 370 are the 2 main ways (along with some EQ adjustments) to get that sound. I would say the sound is 85-90% of that tone.
