Alternator For John Deere Tractor 1040 1630 2040 2155 2240 1975 on Denso Unit. Unit of Measure EACH. Description ALT 12V 40A DENSO. Adjusting Hole Diameter 8. Mount Leg Thickness 21mm. Pivot Hole Diameter 10. Pulley Outside Diameter 62mm. Suits Unit Make Denso. Alternator Mount Single Leg. Mount Cnt to Cnt 138mm. Premium cores and precise OE assembly benchmarks. Designed to meet the grueling heat and electrical requirements. Compact and lightweight design.