Yeah, there is no "standard loot" in AD&D - it was part of the charm.

Anyhoo, if you have access to a stack of Dragon Magazines (or the Encyclopedia Magica) you can pick out some "cool" items there. Otherwise, pick items they would need for the adventure (remember damage resistance!) and let each player design a single magic item that would fit their character concept; like a Flaming Sword of Trollslaying (+1/+3 v. Trolls) that was forged for him by the grateful Dwarven King after the party held off the Endless Hordes of Breakbone the Troll-king.

If you're dealing with decent RPers they can probably figure out what signature item would make them happiest. Be sure to make sure its not too overpowered ("no, you can't have a Double Staff of the Magi") but otherwise roll with it.

Remember: in AD&D magic items were awesome. They may not always have much game benefit, but they always did cool stuff.