I believe the 81s may have gone to the small hazard switch (aprox 1&1/2x1/2 inches), in which case they used a relay for the flashers which is located under the console and fwd of the shifter.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"