I can vaguley remember a conversion being done using the C20 / Vanette front uprights many moons ago. I think dimensionially the vertical height of the upright is not too far off. It is a little taller which is not all bad as you get some more negative camber gain in roll. The biggest difference was the holes for the ball joints - much bigger on the van item. Solution may be to fit van ball joints to 1000 control arms?