I'm pretty sure almost all buggies use the "short" case which would be the 743 belt as you bought.
Your original belt probably shredded due to a problem. Most likely the same thing you're experiencing now.
The tight belt and shaking sound like one of your pullies is engaged when it shouldn't be.
1. Have you inspected your rollers inside the variator?
2. Does your clutch pulley open and close if you pull on the outer half?
3. Is your clutch and bell in good condition?
How about a picture of your CVT?
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My Yerban assault vehicle: 2.2mm stroker crank, 62mm Nikasil cyl, Taida large vavle head, American made valve springs, ported intake manifold, TM 28mm carb, stock CDI, Bando coil, TK exhaust, stock CVT except for the 14g sliders, 13/40 internal gears, 16T drive, 31T axle sprocket, 22" rear tires, and ONE BIG POTATO CANNON mounted on top..........
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