I have only ever found 3 belts. the two from that orge who has a cursed belt and another i can't remember. I have also found another belt which is very cool
something about Hill giant strenth or something. Is there any more

Hill Giant Strength belt ?
Anyway I have ever found only 3 usable belts in BG and none in ToSC. One protect from piercing and from slashing and one from blunt weapon.

There actually is another girdle in BG1, but it's not enchanted, just a normal girdle. It's in a bag or something in the backyard of the Mayor's house in Beregost.

The Girdle of Hill Giant Strength (or whatever) is a BG2 item, not BG1. You can't even get it with the CLUA Console, but you might be able to hack it in with Gatekeeper or something.....I wouldn't know.

Where is the mayors house?

Northeast part of the map, the biggest house in town. It might not actually be the Mayor's house, but I do know some Nobleman with a name lives there. An identical building in Nashkel is called the Manor House.

SPOILER.......
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The house is in the north edge of town. It is a mannor(whatever the hell that means). It's really big with a big fence and yard. The door is locked. After you get in, there are some very agressive guards (you are breaking in). Send your thief in with stealth or invisibility. There is something upstairs in a drawer that is worth the effort.

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Baruk Khazad! Khazad Aimenu! The axes of the dwarves! The dwarves are upon you!

SPOILER
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.You people forgot to tell me about the Golden Girdle 'Golden Girdle of Urnst'

south east of Larswood