i'm willing to try it out, but i can't find any 1/2" in stock anywhere. i've used RMGI 911 but i had considerable problems with the edge tracks losing high-end
...this guy seems to have 4 boxes of 468 in 1/2" format and the description implies he's willing to split. If you're really desperate you might consider asking him about it, but shipping cost will be less than happy and they're probably used.