Correct! Later model 2-series tractor came with nice little plastic covers that used those same two screws. Most dealers take them off and throw them away but I have both of mine and use them. Since I don't have any rear PTO implements I keep it covered all the time. When I take off my snow blower for the summer I attach a cover to the mid-PTO since I do not have a MMM. It keeps the PTO splines nice and clean for next time.Cad missed this!
There is a sheet metal cover that fits over the phillips screws ...dust cover...keeps the shaft clean.
Its srewed on with a half twist if that makes sense.
The small indents next to the screws is where the spring loaded detents seat.