For each of the bikes I've modified I have a box full of original parts in the basement, partially so I can sell the bike as all original when the time comes and partially so that as I become a better cyclist or my riding style changes I can rearrange my bike with original components. i originally took the drop bars off of my SC due to my weak back but my back is getting stronger and maybe this summer I'll put them back on.
On the other hand, i don't think it's a sin to pass this kind of thing along to someone who really needs just this part to complete his or her restoration.
Darn these bikes are a pretty shade of green, no?