Both of those items should work well for you. After long use any featherboard can wear out, i've made my own on occasion. Use that one as a pattern or if you'd like pencil rub the new one and keep it for future reference. If you duplicated the featherboard exactly, it'll be easier to use in the future with the same hardware. Personally I don't like the plastic featherboards so much, they chip and crack when they get old. As far as the router plate goes. It should line up, if it doesn't you can find kits online that work with homemade bases for the guide set.
Best of Luck