Ran across this old post today, though it worth a reply.
I've had three T&R Side lever safties for Mauser 98's from them over the years starting in the late 60's. I still have one. Sent them the bolt shroud and cocking piece,they returned the completed saftey finished and blued.They fit well with no work needed;workmanship was excellant.The last one was done 16 years ago,so I don't know if they are still in business,if so I would not hesitate to have further work done by them!
Best wishes,
Waddie Bill