1. My old Steiny XL2A. Flogged it once, bought it back 7 years later, and sold it again 12 years later. Mug.
2. Both my late '90s Warwick Thumb NT basses: a fretted and a UF.
I know this is a bass forum and bass thread, but I've been tempted, in the past, to order a Firebird I, but I've never been confident in the comms I've had from the shops involved.
Bridge.
I've tried the Hipshot; didn't like it. I have the Allparts on a Greco copy and it's never moved in years.
Scratchplate.
Try Rickysounds in UK.
Tuners.
I would not swap out the wavy Grovers, if that's what you have.