The Gatos - of course! - had variations to their bow limber holes. AMP have a new Library Article on the major variations here: 
http://amp.rokket.biz/reference.shtml  (4th Sub article, purple cover: GATO BOW LIMBER VARIATIONS)
 
 If there is enough interest, AMP will release a PE SET with the major variations AND the interior bow supports. Let us know if you'd like to replace the slightly-out-of-frame and generic limbers with accurate ones.