Not to be a naysayer....but the last 5 years I think I have seen one ladder come up for sale and it was sold in 30 seconds. I just received my ladder from Aluminess and it took over one year to arrive. They definitely are not the same company they used to be in respect to dedication to the E-series vans. It is Sprinter or bust now....if you want one from them I would suggest putting in the order ASAP so you can start the waiting process or finding an alternate source.
There are alternatives out there too. Colorado Campervan built one for me. Many of them are steel though. Can try bajavoodoo. They make steel ladders but their turn around is faster than a year.
The aluminess pieces are very nice. I have bought at least 6 ladders from them.