I could not find a Miller part so I called and was able to locate a hard to find part which they shipped and received in a few days.
Collection: Miller Nuts
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Miller E99-350C44 NUT, SST CGA350
Vendor:MillerRegular price $68.31Regular priceUnit price / per -
Miller 604645 NUT, 375-32 .56HEX .09H STL CAD USE W/POTS
Vendor:MillerRegular price $7.85Regular priceUnit price / per -
Miller 255401 NUT,LOCK .312 HEX ST NYLON
Vendor:MillerRegular price $8.28Regular priceUnit price / per -
Miller 1960012 LOCK NUT, MDX-100 NECK
Vendor:MillerRegular price $8.96Regular priceUnit price / per -
Miller 1960011 LOCK NUT, MDX-250 NECK
Vendor:MillerRegular price $8.96Regular priceUnit price / per -
Miller 280091 NUT,HUB
Vendor:MillerRegular price $9.13Regular priceUnit price / per -
Miller 254843 NUT,PG21 1.50HEX X .375H ALUMINUM
Vendor:MillerRegular price $9.35Regular priceUnit price / per -
Miller 280203 NUT,PG21 1.406 HEX X .281 THK NYLON BLACK
Vendor:MillerRegular price $9.48Regular priceUnit price / per -
Miller 272186 NUT, 750-14 NPS 1.312HEX .413H NYL
Vendor:MillerRegular price $9.48Regular priceUnit price / per -
Miller 289590 NUT,250-20 .63HEX .19H BRS
Vendor:MillerRegular price $9.66Regular priceUnit price / per -
Miller E99-680C44 NUT, SST CGA680
Vendor:MillerRegular price $92.96Regular priceUnit price / per -
Miller E99-677C44 NUT, SST CGA677
Vendor:MillerRegular price $93.61Regular priceUnit price / per