My 335 has a 68 harness in, no idea what the previous owner paid though, but my experience with the RS kits have been very good. I think I have a wiring kit lying around for my SG.
Just a tip, insure the 345 against ANYthing that could happen to it, you don't want some SOB stealing the guitar and you are out all the cash.
This guy can do a valuation for you, that you can submit to your insurance company
andreas@guitarexperience.co.za . I think he charged me R150 in the past per guitar. Just send some pics, back, front, serial etc. I'm in the process of getting a valuation for my ES to get it insured.