1911 9mm magazine

hi guys, i am after an used 1911 magazine or even new for the 9mm. i am honestly just going to use it to take some dimensions from bcs i am building a 9 bolt action, so do you guys know where i can get a cheap one.
any input is appreciated.
regards
mfg

OK , try the ususall suspects , Reloaders , SS , etc , either a 9mm 1911 or a 38 super 1911 would maybe work , or if not a std 45 one just for the size ?