Re: mower bracket
Your going to have to give a lot more info!
Model # of the mower deck?
RC60-25
RC72-25
Other
There is no one part called the mainstay, it's a group of parts, main stay 1, main stay 2, main stay 3, so be a little more specific on what part, pictures help.
If it's the Right Hand Stay on the RC72-25 P/N is 76551-51190
If it's the Right Hand Stay on the RC60-25 P/N 76540-51190
EDIT: After merging your two threads I see you list a Model #, are you sure that's the right # as that mower should have been on a L2850 not an L2550
But if it really is a RC72-28 then the part # of the Right Hand Stay is 76550-51190
Make double sure of the model # as all the part #'s are different.