You might make note of how many speed settings your heater switch has... On my 84 toyota, there are only 3 speed settings, and on my 85 toyota there are 4 speed settings. There is a different heater blower resistor for each.
By the way - I just paid $19.90 for the 4 speed resistor on my '85... Part number is in the parts number thread at the top (for the 80's Toyotas).

Ken

1984 Toyota 4x4 Truck, 4.88's, 32x11.50's, weber 32/36, aux gas tank, Warn 9500i, SR5 guages, tilt/altimeter, Alpine stereo with dual 12's behind the seats.