Here you can find the direct links to all iPad Firmware Files for every released model.

3.2.0 (iPad 1): iPad1,1_3.2_7B367_Restore.ipsw
3.2.1 (iPad 1): iPad1,1_3.2.1_7B405_Restore.ipsw
3.2.2 (iPad 1): iPad1,1_3.2.2_7B500_Restore.ipsw
4.2.1 (iPad 1): iPad1,1_4.2.1_8C148_Restore.ipsw
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4.3.0 (iPad 1): iPad1,1_4.3_8F190_Restore.ipsw
4.3.0 (iPad 2 Wi-Fi): iPad2,1_4.3_8F191_Restore.ipsw
4.3.0 (iPad 2 GSM): iPad2,2_4.3_8F191_Restore.ipsw
4.3.0 (iPad 2 CDMA): iPad2,3_4.3_8F191_Restore.ipsw
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4.3.1 (iPad 1): iPad1,1_4.3.1_8G4_Restore.ipsw
4.3.1 (iPad 2 Wi-Fi): iPad2,1_4.3.1_8G4_Restore.ipsw
4.3.1 (iPad 2 GSM): iPad2,2_4.3.1_8G4_Restore.ipsw
4.3.1 (iPad 2 CDMA): iPad2,3_4.3.1_8G4_Restore.ipsw
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4.3.2 (iPad 1): iPad1,1_4.3.2_8H7_Restore.ipsw
4.3.2 (iPad 2 Wi-Fi): iPad2,1_4.3.2_8H7_Restore.ipsw
4.3.2 (iPad 2 GSM): iPad2,2_4.3.2_8H7_Restore.ipsw
4.3.2 (iPad 2 CDMA): iPad2,3_4.3.2_8H8_Restore.ipsw
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4.3.3 (iPad 1): iPad1,1_4.3.3_8J3_Restore.ipsw
4.3.3 (iPad 2 Wi-Fi): iPad2,1_4.3.3_8J2_Restore.ipsw
4.3.3 (iPad 2 GSM): iPad2,2_4.3.3_8J2_Restore.ipsw
4.3.3 (iPad 2 CDMA): iPad2,3_4.3.3_8J2_Restore.ipsw
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4.3.4 (iPad 1): iPad1,1_4.3.4_8K2_Restore.ipsw
4.3.4 (iPad 2 Wi-Fi): iPad2,1_4.3.4_8K2_Restore.ipsw
4.3.4 (iPad 2 GSM): iPad2,2_4.3.4_8K2_Restore.ipsw
4.3.4 (iPad 2 CDMA): iPad2,3_4.3.4_8K2_Restore.ipsw
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4.3.5 (iPad 1): iPad1,1_4.3.5_8L1_Restore.ipsw
4.3.5 (iPad 2 Wi-Fi): iPad2,1_4.3.5_8L1_Restore.ipsw
4.3.5 (iPad 2 GSM): iPad2,2_4.3.5_8L1_Restore.ipsw
4.3.5 (iPad 2 CDMA): iPad2,3_4.3.5_8L1_Restore.ipsw
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5.0 (iPad 1): iPad1,1_5.0_9A334_Restore.ipsw
5.0 (iPad 2 Wi-Fi): Pad2,1_5.0_9A334_Restore.ipsw
5.0 (iPad 2 GSM): iPad2,2_5.0_9A334_Restore.ipsw
5.0 (iPad 2 CDMA): iPad2,3_5.0_9A334_Restore.ipsw
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5.0.1 (iPad 1): iPad1,1_5.0.1_9A405_Restore.ipsw
5.0.1 (iPad 2 Wi-Fi): iPad2,1_5.0.1_9A405_Restore.ipsw
5.0.1 (iPad 2 GSM): iPad2,2_5.0.1_9A405_Restore.ipsw
5.0.1 (iPad 2 CDMA): iPad2,3_5.0.1_9A405_Restore.ipsw
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NOTE : Thread will be updated as new Firmware Versions & Models came out