[Athol Holloway]

hi guys sorry if this has been asked before but i have a 2011 CRF450x the one with the flipping small 6.1lt tank. a mate of mine who lives 300kms from me has the CRF450r and just put a long range tank on his and is willing to send me his old 7.5ltr tank. before he goes through the effort i would like to know will it be a straight fit or will i need to do any modifications ? please advise.