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Hi @Jack_Lamport1 and welcome to our forum.
You can find the dimensions on this drawing:
https://www.robotshop.com/media/files/images2/12v-100rpm-583-oz-in-brushed-dc-motor-desc-dime.jpg
This L dimensions depends on the gear reduction used.
Since this is 50:1 motor, it should be 26mm.
Feel free to ask anything else.