Engine/Transmission (1994 - 1998) Magnaflow muffler P/N?

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I am fabricating my own exhaust system from several other pieces of 4" aluminized pipe. I want to install a magnaflow muffler. After searching this site and several others I could not figure out the right part number for a 20" round muffler that would fit a 4" pipe. Can anyone help with the P/N so I can order the right one from the net?

Thanks

 

[A-bomb]

Never mind, I finally found the PN on the Magnaflow site. I think it is 12770