Wanted: 4 bolts to install a granny ring

Hi lads

Just wondering - would anyone have 4 small bolts to install a granny ring? they can be rubbish, steel, old covered in rust. i dont mind. something you wanna kick out. my girlfriend's bike cost me 100quid and don't wanna pay 10 for 4 bolts.. this is madness what they do with prices on such small stuff.

it is truvativ crankset if it matters
Thanks

L