It's growing by the day it seems, I just lost a rear wheel bearing at 120k. Though that isn't something I think one could successfully repair without a press.
I planned to do some more side by side notes when we get the race car back at the shop for prep, that should be happening in the coming weeks.
As for my personal spares or things I'll be adding:
Serpentine Belt
Inner tie rod ends
L&R Outer tie Rod ends & hardware
LBJ
UBJ
F&R U-joints and driveline hardware
Fluids
Oil filter element
Plug & Coilpack
APPS
F&R wheel studs and nuts
F&R brake pads (can safe day in event of damaged caliper)
UCA, LCA and Track Bar hardware
Cheapy ABS sensors
I'll have to pop my boxes and think of others
Fwiw with the race car, we also carry all of the above (on the car) and:
Rear track bar, UCA and LCA
Throttle Body
ECU (mounted and a few minutes to swap)
Rear driveline (complete)
When we race, we take everything in the chase trucks but an engine and transmission... any whatever new part we break