Aye, true that.
are you sure you need to replace the "palm pedal" maybe all it needs is a good setup.
i never liked my mustang trem, but then i gave it a bit of TLC and it works like a dream. just take it to a guitar shop, such a great guitar needs to be fully working.
as for the P90, just buy a new PG that guitar is F'd up enough that keeping it stock seams silly.