1) Yes it slides a hair to the left and right 2) Regular old license plate screws from any car parts store will work. I bought these on Amazon:
DLLL License Plate Fasteners Skull /Skull motorcycle screw/Ghost decorative screws for Harley, HONDA YAMAHA KAWASAKI SUZUKI HARLEY DAVIDSON CRUISERS METRIC BIKES MOTORCYCLE (4pcs Black) https://www.amazon.com/dp/B00VNFRCV6/ref=cm_sw_r_cp_awd_UR9YwbX42N2GQ