don't currently have a 126 but from experience there is no difference in the two "sound deadners".
From experience I can tell you that you should always do the larger panels first, like the inside of the doors, the roof, the floor & the firewall in that order.
Good luck.
From experience I can tell you that you should always do the larger panels first, like the inside of the doors, the roof, the floor & the firewall in that order.
Good luck.