Tubeless valves by Stan's. With a tapered gasket for reliable first time sealing and a removable valve core for easy inflation and sealant top-ups, the originals are still the best. Black are aluminum (slightly lighter), silver are brass (won't ever break).
GOAT, Hotfoot, GX24 and alloy rims use 44mm length
RCG and All Road 35 use 55mm length
Cafe Racer, All Road 50, and Rail 55 use 65mm length.