- 1972 Simplicity 4040
- 1973 Simplicity 4041
- 1974 Simplicity 9020
- 1975 Simplicity 4040 Deluxe Variant
- 1976 Simplicity 4041 Special Edition
- 1977 Simplicity 9020 Turbocharged Model
- 1978 Simplicity 4040 with Enhanced Features
- 1979 Simplicity 4041 with Hydraulic Upgrades
- 1980 Simplicity 9020 PowrMax Premium Model
- 990705 - Pow'r Max Tractor - 4040
- 990953 - Pow'r Max Tractor - 4041
- 990954 - Pow'r Max Tractor - 4041
- 1690072 - Pow'r Max Tractor - 9020
- 1690230 - Pow'r Max Tractor - 9020
- 1690283 - Pow'r Max Tractor - 9020
Production/model years: 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980.
Serial numbers: 990705, 990953, 990954, 1690072, 1690230, 1690283
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