Currently working on my old 5120. Installing some Filtertons and replacing the bridge. To fit the filtertons i did some modifications to the pickup cavitys, first i glued in some solid ash blocks (I had some scraps) to the underside of each pickup hole to create small shelves, then i attached some wooden bars underneath the pickups that will sit on top of the shelves. i used some self adhesive compressed rubber that i bought a roll of from Amazon and attached these under the wooden bars to raise the pickups. Im now just waiting on some gold pickup bezles to be delivered so i can finish it off! I upgraded the bridge to a Gotoh Nashville that has locking saddles so you get zero rattle. I couldn't afford TV Jones pickups or Gretsch pickups but i found some great cheapish filterton style pickups from Allparts, they look the part and sound great!