Put your ring in place then take a very sharp drill bit and push hard to drill holes thru floor,
place boot over shifter and get it at the look you want ( short or Tall )
place ring over edge of boot an use a hole finder (awl, scatch awl, pick ) to locate holes
run screws thru holes, If there is material showing around ring carefully trim with a blade.
stand back and admire your work
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