E55750 is a key used on 1214, 1380 mower conditioner and a 4310 beet harvester. Specifications from Deere:
Width=.249 inches
Length=1.469 inches
The parts book references I have are:

1214 Page 14 Key 13
1380 Page 17 Key 12

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  • Item #: E55750
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Price $5.00
Availability In-Stock
# Available 1