11.75 brake question

Ok so I have the stock disc brake setup from a 1974 Duster 360 I'm using in my 1970 Duster. I know the stock brake rotor are 10.87 (right around that size) and I have the 11.75 sliding adaptors and 11.75 rotors. The question is about the dust shields. Do I need the dust shields from a donor car that came with the 11.75 rotor or will the stock 10.87 dust shields work/be fine with the increased rotor size? :salut: