My D44 from a 83' waggy on the pathy is 60.5" & the same as the 85' I have rebulid for the X.

When I was looking I came across a couple grand waggy's marked 86 & 90' and they where actually about ~ 3" wider with slightly different steering componets. When you look parts up they seem to change in 86' with the Grand waggy name change over from the standard waggy.

Since the steering, adapters, and geometry is setup for something specific & bolt-on I would go with the recommendations until I know otherwise for sure.