It is intended for the common 1:64th scale gravity wagons by Ertl, but it is likely there are other wagons that will work as well. J&M, Brent, Parker, other.
Gravity Wagon Extension - Ertl - For Gravity Wagons
Gravity Wagon Rung Ladder - Ertl - For Gravity Wagons
VTG ERTL Case 2590 Tractor 1/16 Scale Diecast Farm Toy 1979 w/Red Gravity Wagon
1/16 E-Z Trail Gravity Wagon Limited Edition From Speccast
Spec Cast 1/64 Unverferth 630 Green Gravity Wagon UBC-057
ERTL 1/32 IH Farmall 806 Tractor with Gravity Wagon 44435
