wow , not many have a 3q anyway ! i'll check , see if any other will fit , but im sure someone knows on here .. what is wrong with the float you have ? missing or just leaking . they i think are brass so can be soldered when you find the hole , most times they only get too hot and old age will make a small leak in the joint. only have one so it might be later tonight

........... just had a look , and completly different , so maybe a 3L complete should do the trick . just check where it came from and jet sizes then as far as i know it should be ok