i bit the bullet too one the same parts because i didn`t have sunvisor plates at all-i haven`t tried installing anything yet but i fully understand your questions...and it has got me worried. the items are pricey and i would expect a great reproduction for the price. i`ll keep an eye on this thread.
have you tried to install any of this?
i don`t need any more odd shaped paperweights.
best of luck
frank.