I have a Trek 1000 with a quil stem. In making the bike fit my body properly, I needed to raise the stem up an inch or so. However, I was maxed out at that, so I needed a longer stem. Nothing I could find at the used bike store was longer. Also, is the skinnier type (supposedly 1 inch, but I measured the tube at 6/8".
Options:
Upgrade to Ahead setup. Get the vertical post insert going into the fork, then the ahead stem.
OR
Get old school adjustable quil stem so I can angle it wherever I need it to be and those are pretty long so I'd hope it's high enough.