I don't know much about the window removal in a 49, but seems like most door windows only come out in order with the vent window retainer removal. Tech tips and searching lots of threads helped me figure mine out. I happened to see this bolt removal package at Lowe's last night. I don't know if things like this work or not or are gimmicks. I have drilled my share of bolts out when I have no other option.
Irwin bolt removal kit 
