Well try just get roof measurements,and let the little tape measure hook grab the hatch end and drage up to edge of front seal, try find centre of the roof for all the measurements for each one you do and stretch the tape directly over the roof.
If someone else can do this aswell from sprinter with no front window be good aswell.
Needs to be pretty spot on otherwise my front window moulding wont fit
Hope people can help me, be very very happy to finaly get my car back on the road with full redone interior, paints and mags :):):):)