You can find all the replacement parts you need at Escapa.
The Progress PG-401 MTB M14x1.5xL156mm Fox Boost Front Thru-Axle is designed specifically for Fox forks with a 15x110mm Boost axle.
FEATURES:
PG-401 front thru-axle with Allen screw lock.
Material: 7075 aluminum.
Size and thread: M14*1.5
Length: 156mm.
Fastener: Allen key.
Weight: 42 g.