638 V CLASS sliding windows

I recently bought a set of brand new windows with sliding glass openers just like you see on the vw vans ,
but when i offered them up to the door with the old glass still in, they were approx 2 inches short in length and
would of left a big cap between the sliding door glass and the rear window glass.
They were advertised as fit any 638 vito , but when i contacted the shop and told them they said that they fit
vito 638 van not the v class , so i asked for a refund which they agreed to if i sent them back at my own expense.
My question is ... does anyone know where i can get some that fit properly and flush. ive been looking for ages and thought i had struck gold when i found these ones brand new on ebay from Van Pimps Leicester.