M101 1/4 ton Wheels

[timbuk2]

HI,
just bought a DND M101 1/4Ton trailer. Looking to get a spare tire+wheel. My question is what wheel will fit? are they generic
wheels or are they army specs? Any help would be great !

 

[TM98]

The bolt pattern is actually a 5x112mm. A lot of people change the hubs to get a different bolt pattern.