The Spacer(6.1x9x7.5) is the cheapest item from this partsfiche.
eleven components are listed in the schematic for this Gp125u 1979 (n) (01 02 04 06 10 13 14 17 18 21 22 24 32 35 41 42 Battery .
Of all the components used in this assembly the Battery Assy(6n4-2a4.2ah) is the most expensive.