I just bought this Matco service cart used and have a couple of questions. It looks like the MSC4BK but only has two rows of drawers, both are full width drawers. The lid support is a hinge type and I would like to change to the strut type, where can I purchase this from online. I would also like to add on the side tray, is it the same one as for the MSC4BK, the measurement beterrn the side rails is 17".