1987 Ford F-250 width of wheel base

Wheelbase is the distance between center of front and rear hubs, front to back. Is fairly simple to measure, could be any of the below depending on exact VIN you got.

Wheelbase

116.8 in (2,967 mm)
133.0 in (3,378 mm)
138.8 in (3,526 mm)
155 in (3,937 mm)
168.4 in (4,277 mm)

Length

194.1 in (4,930 mm)
215.9 in (5,484 mm)
232.2 in (5,898 mm)
210.2 in (5,339 mm)
245.7 in (6,241 mm)

Width

79 in (2,007 mm)