small drain plug...where to get?

[aqua]

I am looking for a couple of drain plugs like what come on sitdowns....something a bit smaller though so it would fit underneath my exhaust manifold on my sj. here is a pic of what i am talking about. has anyone ever seen these or something similiar in a smaller version.....most of these things go in a 3/4 - 1 inch hole which i am afraid i might not have that much room to give. thanks

 

[2lick]

here is what i did, as recommended by mark44....

http://picasaweb.google.com/addicted2tech/Drains/photo#5052396645697939698

its 316 stainless plug with 1/8 npt thread (had the tap for cooling)
Nylon is MDS Fileld 6/6 3/4 inch round

I glued nylon to the back and drilled and tapped..... easy...

I have like 6 feet of nylon and 10 or so plugs if anyone else needs.. pm me... shipping and like 3 buxs....