silver - you're in luck.
i just replaced my working waterpump (was 80k so i just replaced it for precautionary reasons) and since i bought it at the dealer, it came with entire housing/pipes/waterpump assembly.
so that means i have my old waterpump assembly (water pump still working, impeller fine as far as i could tell.. just don't know how many more miles / years it'll last) and that includes housing.
i held onto it thinking i might need it one day, or someone else might.
if you want the housing, i can ship to you free if you pay for the shipping. i don't need it..
i'm in michigan.
how'd you get the hole anyway? that's wierd... it's not the weep hole right? i havne't really checked mine in detail, i'll check later tonihgt.. but i don't know how you'd get a hole in housing..