6PKRTSE,
I looked into this a few months back. I don't have a specific source. I checked some online salvage yards that specialize in Mopars. I recall one quote of 450 to cut it off plus shipping. Not a cheap piece. I saw some rusted out swapmeet ones going for 200+. New taillight plastic from year one is 400+ then you have to find buckets, and the benzels usually need rechroming. Needless to say I am going to leave mine a 74 and sell my 70 front clip.