Joe Salter has M1 Carbine parts now.

I do not know whether parts are original or not! $75.00 for a WWll sling!!!

JoeSalter.com

Joes been selling these parts for a while.
Ive gotten some great Enfields, and bayonets from him, and he recently sold a nice early Inland M1A1 for 3500.00...100K range..
Joe sr. and Joe Jr. are great guys, but not carbine experts. They are very reputable, and back everything 100%..

I have dealt with him, and I got the idea he was not real knowledged in Carbines, but a hell of a nice guy. I bought a part from him and it was excellent, and he followed up with e-mails to make sure I was happy.