Wanted: aerospoke hex bolt/washer for track axle front

Ugh so I lost one bolt/washer from my front aerospoke fixed hub in transit.

Has anyone got a connect who might have some spare parts.

Is it a standard m8 hex bolt?. Or can someone with knowledge tell me would encore wheels use the same sized bolt? Perhaps they’d be able to sell me a set of bolts if it’s the same size?