Small, medium, large, extra-large, and B'T X 
Neo.  :P  I have six cels from that OVA, and 
they're all far too large to fit in even my big 
cel binder.  Had to actually build something for 
them out of strong cardboard and pieced-together 
cel bags.

Here's the king of the lot (a three-stitch scan) 
-- Ron on his B'T, Raidow.