The projection for sizes
Single hole 50mm =2 overall inches
64mm (2.5in hole to hole)/ 4in total length.
94mm hole distance 3.78inch / about 6inches end to end
128mm hole distance 5inches/ about 7.5 inches total length
160mm hole distance 6.3inch/ 8.5inches in length
192mm hole distance 7.5inch/ about 10 inches long