Shades of DaveC who was looking for a similar battery holder for 4 x AA cells with a removable lid or drawer. DaveC required the holder to be only 2 cells wide at the front but the Bulgin item which did have a drawer front was 4 cells wide so it was no good to him, as you would be aware.
No manufacturer can afford to produce battery holders to cater for all the different combinations of cell types and mounting arrangements that any individual might require, at least not without a substantial order of around 10,000 or more. Usually, a product manufacturer will design his own when no off the shelf item is available. Unless you can find somebody who has/had the same requirements as yourself it looks like you'll have to fabricate them yourself. Are you sure you can't make do with two side-by-side Bulgin BXS018 or BX0003?