I totally get being hesitant to order parts online -- but since it can be hard to find quill stems, etc, I wanted to point you towards a website that has a huge selection of components including parts for older bikes. It's called "Alfred E. Bike" and the url is www.aebike.com. I've ordered a variety of parts (stems, bars, seatposts etc) from them and I've had a good experience. But I've never had to return anything, so I can't comment on that.

Good luck with everything .