Righetti Ridolfi fuel tanks are a great all rounder tank. The 3 litre size tanks are available in 2 designs "quick release" & "between steering uprights". Lightning & BRK karts use these tanks as their factory tank. The larger size tanks are available in "quick release".
"Quick release" mount hole measurement is taken with the tank sitting flat in the kart to centre of mount hole with the tape running parallel to the tank.