Some more information for you...
It was made by a French company whose UK agent trades under ACGB. A search will reveal their website, which is more basic than the actual range available.
A summary of the options for Sprinter are:
110 litres 53x21x124
130 litres 53x21x145
140 litres 71x21x124
170 litres 71x21x145
200 litres 71x21x175
265 litres 71x21x224
The last two require the use of an additional mounting point.
I would struggle to supply engineer's drawings for the one I've got. The best I could do would be a few photos and some scanned images of the instruction leaflet.