they arent rare at all. i have half size cases and i make my own half height brackets using the stock ones.
break out your trusty nibbler, marker and hammer, a vice is also handy.
How to make your own:
insert your card into desired slot.
take your marker and mark where it goes past the part where you screw the bracket on to.
now disassemble the card to take off the bracket.
place the bracket in a vice where the jaws of the vice are just below the mark you just made. tighten the vice down then whack away with a hammer (rubber mallet or plastic hammer preferred)
now use the nibblers to cut away the extra metal leaving enough to make your tab and screw hole/slot.
reattach the bracket to the card then test fit.
it may take a few trys but when you get a hang of it its a cinch.
hey asap18 you for got this too:
http://www.newegg.com/Product/Product.asp?...N82E16814998301