So Head, Volkl, Donnay, Pro Kennex, Boris Becker and Pacific racquets have removable/replaceable plastic pallets instead of molded foam handles (like Wilson, Babolat, Prince, etc.). But which pallets from one brand will fit on a racquet from another brand? For example, say I've got Volkl frame but prefer the slightly more rectangular Head handle-shape. Can I put a Head pallet on a Volkl frame? How about on a Donnay? I'd like to make this OP a go-to post for anyone wondering the same thing. So any contributions you'd like to make I'll incorporate into this post with edits, hopefully compiling a definitive list.