Rebuilt Automotive & Powersports Carburetors › Mounting Studs 1-3/8" Image 1 of 1 Mounting Studs 1-3/8" $6.00 Mounting studs for standard base gasket with no spacer. 12mm nuts. Add To Cart Added! Mounting studs for standard base gasket with no spacer. 12mm nuts. You Might Also Like Quick View 1/4 NPT Plug Allen Head $2.00 Quick View Air Cleaner Stud & Wingnut $4.00 Quick View Base Gasket .050" $2.00 Quick View 1/4" NPT to 3/8" Hose Barb $5.00