It is the type with the diamond shaped dividers mounted on rods. The bin has a gap in the front face to allow for brake adjustment, not a modification, it was made like that. There is also a cut out in the inner side, the armour plated side, to allow for the gearbox oil filler. This is why a 15 round box only holds 14 rounds!
As for the catches, there is at least 5 on the inside bins, I still have to check on the bin behind the driver, it has 3 I think.