Is this what you're talking about?
http://www.ebay.com/itm/VINTAGE-APPLE-Macintosh-SE-II-SE-30-Hard-Drive-Bracket-Activity-LED-805-5066-B-/390608275838?pt=US_Vintage_Computing_Parts_Accessories&hash=item5af211497e
I don't have immediate access to one, but if this would work, it could be an option instead of the 5.25 / 3.5 brackets.
-Pat