simplicity regent hydrostatic

I have a simplicity regent hydrostatic 16HP 1692762 lawn mower. I took the transaxle apart and when I was cleaning the parts in kerosene I found these two little parts. Pic is attached. They are about a half an inch in diameter. Does anyone know where they go? I appreciate any help I can get.

Try to locate the MAKE & MODEL of the unit, (usually located right on the trans. itself) then go to the manufacturers parts manual and see if you locate them there. There are hundreds of trans. by many manufacturers, YOU need the make & model numbers to locate the info. There is some members with trans info. post when you find yours.

Thanks for the reply. The tag got torn off of the transaxle but I figured out where the pieces go. They go inside of the plunger like thing that goes in the block cylinder where the spring goes. Pic attached. Thanks again for the help.