Go to a muffler shop and grab a length of 2.75 inch muffler pipe, go to a mower shop and get 2x GA spares CHD1833 (scott bonnar roller ends.
Cut muffler pipe length to suit, the roller ends will bang straight into the muffler pipe. Hopefully the shaft dia of the end caps is 3/4", maybe you might have to turn the plastic ends out on a lathe a bit
Can even buff the muffler pipe up to a shine if you are so inclined
