They do have alternators for sale. I bought one for my 70 Challenger last year at Carlisle. It comes with a cd showing the whole process from begining to end. Beautiful piece.

1965 GTO 4 spd tripower convert 1966 GTO 4 spd a/c factory red on red 1969 1/2 Superbee 4 spd butterscotch 1970 Challenger RT 440 4 spd factory black on black