cab mount bushings

[twotrucks]

I need info from those that have used the aftermarket cab mount kits that various board vendors sale. Question is should there be a washer on top of bushing (between the bushing and cab floor) for the front mounts. The kit I have does not have a washer large washer that will fit the bolts supplied. It does have washers that obviously go with the conical bushing at the nut end of the bolt. I have an assembly manual and it shows a washer above at the cab floor but these are aftermarket. The hardware supplied is yellow cadmium plated but have no marking at all on the heads?