Turnout Frog Replacement Needed

Hello,

Today I just recieved a LH/RH pair of Lionel 42-inch O27 turnouts--my first ones!  However, the frog in my right-hand turnout was covered in white corrosion.  The left-hand one is fine, though it does look somewhat dull.  Fortunately, the frogs are very easy to remove, therefore easy to replace.  What are the item numbers for the frogs, both left- and right-hand?

Thanks,

Aaron