Just recently on another board, someone semi-confirmed that they also played:
Bob Welch's "Angel" (Christine on vocals) and Danny Kirwan's "Child Of Mine" (Lindsey on vocals).
I said "semi-" because I'd previously heard that they played both of those tunes with Stevie handling lead vocals on both.
But, this confirmation sounds a bit more realistic. The person who originally told me about these tunes probably couldn't take his eyes off of Stevie so when she sang the harmonies, he probably assumed she was singing lead.
There's a little nagging vague recall in the back of my mind that they played "Black Magic Woman" (Lindsey vocal) in 1975 when they played Anaheim Stadium and opened for Loggins & Messina/Rod Stewart & Faces.