Use the stock bolts, 1/4-20 nylock nuts on the inside.
I did basically that. Bought some stainless bolts and washers and lock nuts similar to the ones I put the fairing together with. Also got some 1/4 20 u nuts and clipped them on the brackets to make it a bit easier to r+i the chin
I just finished up putting my chin back on, After seeing it back on I missed it and am glad I finally put it back in place and it still shows my Keda pipe made by Dean Adams.