Stock on our website is just an indication if we have it in our warehouse or not. Meaning if something is in stock and you order if before 12:00hr (local time in the Netherlands) we will ship it out the same day.
If stock says "zero" or "Backorder" you can order it and we will start producing it. As you may know we do production our self in house. The only difference is the lead time. When an item is not in stock production will take about 5-8 business days.
So you can always go ahead and order even if the stock is zero or backorder.
NOTE: By default ALL of our Color on Demand / RAL colors are in backorder. Reason being is that Color on Demand / RAL is a "made to order material". These materials are all custom made. And since there are 1000's of RAL colors we can't keep stock of this item range.