Your search for "chain conversion kit" revealed the following:

2000-03 Stock SwingArm Sportster Belt to Chain Conversion Kit — $166.06 +

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$8.24

1991-99 Stock SwingArm Sportster Belt to Chain Conversion Kit — $156.56 +

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$8.74

2000-03 Rigid Frame Sportster Belt to Chain Conversion Kit — $166.06 +

Wide Tire Sportster Belt to Chain Conversion Kit — $209.95 +

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$8.24

1991-99 Rigid Frame Sportster Belt to Chain Conversion Kit — $156.56 +

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$22

Evo Rear Sprockets — $64.95 +

Oil Seal for Main Shaft & Sprocket Shaft — $3.95 +

Sprocket Spacer — $35.95