I have the Nancos mounted on 4 inch sysmic wheels and my dimension are almost identical to yours. 20.6x8.75
NAPKA US541
HQ: Beamer V 5.0m,
Best: Bularoo 7m, Waroo 9m, 12m
PKD: Inferno 9m, 12m, 16.5m,
Ozone: SubZero: 5m, 7m, 9m, 11m, 13m, Access 6m, Pure 6m, Chrono V2 7m, V4 13m, Chrono EXP 7m, 9m, R1V3 21m
Buggies: GT-Revolt, GT-RazR,