H-D #51774-31, 51775-31, 51777-30, 51778-30, 51780-30 Special - 7 Piece Mixed SPRING Set - Larger Diameter OD Springs as used on Big Twins for 1936 - 1980 Harley Big Twin "Pogo" SEAT POST PLUNGERS Special Spring Set includes 3 Springs for Inside Plunger (51778-30 & 51780-30) for Rider Weight Adjustment - under 200 to over 250 pound Riders Diameter of these Springs fits Knuckle, UL, Pan & Shovel Pogos with Standard 15-7/8" or Special 16-7/8" Long Spring Rod Set includes Fitting Instructions & Diagram (see Chart)
H-D #51774-31, 51775-31, 51777-30, 51778-30, 51780-30 Special - 7 Piece Mixed SPRING Set - Larger Diameter OD Springs as used on Big Twins for 1936 - 1980 Harley Big Twin "Pogo" SEAT POST PLUNGERS Special Spring Set includes 3 Springs for Inside Plunger (51778-30 & 51780-30) for Rider Weight Adjustment - under 200 to over 250 pound Riders Diameter of these Springs fits Knuckle, UL, Pan & Shovel Pogos with Standard 15-7/8" or Special 16-7/8" Long Spring Rod Set includes Fitting Instructions & Diagram (see Chart)
