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I have 4 larger sockets in my shop: 1,1/16 1,1/4 1,3/8 and 1,1/2 The 1,3/8 fits the fork caps. The others all fit something including the two you are looking for. If no one comes up with the specifics buy all 4 of these - you will need them sooner or later.
You cannot get any of these in 3/8" drive. Mine are 1/2" except the 1,1/2 which is 3/4" drive. I use a converter for that so i use a 1/2" drive handle for all of these.
Also, i use a 4' or 5' length of steel pipe on the handle to remove the two you are about to work on. These are installed at about 150 ft lbs, and you need the long pipe to get them off. Many guys recommend against using an impact for the engine sprocket nut as it could throw off the balance of the crank.
I keep the sprockets from turning by jamming a 1/8" X 1" X 4" piece of steel stock between the sprockets.
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