Get a small piec of 1x2 hardwood from Home Depot or Lowes. Cut out squares about 1", That material is 3/4" thick. Drill a hole in each square and you have your 3/4" spacers.

I assume this is the V2 Extra. If so cowl bolts are 8-32, canopy is 4-40 and wings are 1/4"-20.

TF