Okay I have done the first part and moved onto the second part of crafting. The first part was reasonably easy as you just buy the MK II items from sol station. Now it's MK IV items that are needed but I can't find any trader that sells these items, they all seem to go from MV III items to MK V items so where do I buy the MK IV items, so I can carry on crafting.

have you tried looking at the requsition traders on stations.

im not 100% sure but im pretty certain i have seen a few