it's also possible to enable -console in startup parameters (that can easily be done in one of steam's window in the game properties) and then use devcommands to spawn in replacement gear.

You don't even need to know the exact name of the item, if you type any part of the name it shows you all items that include that word, and once you know the format, you can start typing it out and the choices keep shrinking as you go. if you misstype they all disappear, so back up and keep typing.