plugs for grate on pump shoe end

I have a 97 xp that the grate went missing on. I ordered the grate to
find there are some sort of expansion plugs in the pump shoe that the
bak end of the grate bolt into.

My dealer says that I have to re-order the pump shoe as there are not
a sub component. I sthere any sort of substitute for thedse plugs, as
the idea of taking out my pump shoe, and replacing is kinda lame.

Any thoughts would be appretieated

AL (Wish I checked my grate last season) McD