MerCruiser Alpha One Clutch Dog 52-66063 Sliding Gen I Lower Unit Gearcase 70-90 Couplers these were from a running

these were from a running engine

1961: 10022 / 10023 / QD-22 / QDL-22

I've also included a photo that does a good job of visually portraying the dimensions

I'm not sure how long they have been sitting

MerCruiser Alpha One Clutch Dog 52-66063 Sliding Gen I Lower Unit Gearcase 70-90 Couplers these were from a runningItem Details MerCruiser Sliding Propeller Prop Shaft Clutch dog 52 66063 used in all MC 1 R MR Pre Alpha Gen 1 Alpha 1 lower units 1977 1990 Used but in great shape! This is a stock photo you will receive one in similar condition. Application OEM SLIDING CLUTCH 52 66063, Same as: 52 824112 52 853594 52 853594T & aftermarket Sierra 18 2202 For 888 drives s n 3784375 and up For #1 drives s n 3469428 and up They used the same lower gearcase with all of