This site sells several kits for the Holley carb. and rebuilt carbs. Below is a listing of what they have. Does your carb model number match up with any of them?
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Carburetor Kit, Basic - Kit for Holley R2923-1A, 2923-2, 3012-2, 3013-2, R3012-3A, R3013-4A, 3012, R3013-4F, 2923A, R3012-3, 12R31338, R3658A carbs on 2000 3 cyl., 3000 3 cyl., 4000 3 cyl., 5000. (Part No: H102) $28.00 [Enlarge Picture]
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Carburetor Kit, Basic - Kit for Holley R4119-A, R4119-1A, R7867, R8552, R3656A, R3655A, R4120, R4120-1, R6863, R7896, R8553, R3657, R4111, R4111-1A, R6852, R8554, R3210, R3658 carbs on 2000 3 cyl., 3000 3 cyl., 4000 3 cyl., 5000. (Part No: H101) $28.00 [Enlarge Picture]
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Carburetor Kit, Basic - Kit for Zenith 13913, 13914, 13912 carbs used on 2000 3 cyl., 3000 3 cyl., 4000 3 cyl. (Part No: Z107) $36.00 [Enlarge Picture]
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Carburetor, New - This Zenith carburetor outperforms the original carbs used on: 2600, 3000, 3400, 3600. New replacement Zenith carburetor. For 3 cylinder 175 CID engine. Replaces OEM# C7NN9510C, C9NN9510B, D3NN9510B, D6NN9510B, D8NN9510BA, D3NN9510C, D8NN9510CA. Center to center on the 2 mounting bolts is 2 1116 inches. Made in USA, 1 year warranty. (Part No: 13914) $284.24 [Enlarge Picture]
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Carburetor, Rebuilt - Fits 2000, 3000 series (3000, 3400 etc), 3 CYL. - replacement for OEM R4119, R4120, R8552, R8553, LIST6863. Add $50.00 core charge to price - this charge is refundable if you send your core to us. (Part No: 1318-CARB) $164.73
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