Can confirm everything this man said. My Rick’s… um…. jewels grew at least 4 sizes with this very swap. It still sounds like a Rick, just one that transformed into a werewolf at Midnight.You’d love the 4004’s hb sound, then! I’ve also seen people replace one or both of their 4001/3 pickups with Rick HB1s.
The only problem with that is the standard wiring harness’s pots tend to choke the excellent treble response of the hb1s.
A new hb-appropriate wiring harness fixes that.