126b is Kay Sera @iafd
http://www.iafd.com/person.rme/perfi...f/Kay-Sera.htm
She is in the final scene of Grandma Does Dallas (1990):
http://vintage-erotica-forum.com/showthread.php?t=67872
As you can see the screenshots are rather small, so to make sure it was her I downloaded this film (a higher quality version which I found on another forum). It is definitely her - she even appears to be wearing the same watch, suspenders and stockings.