I was looking for a cheap soulution to fix my defroster on the Pig and looked at the vacum cleaner places and found nothing. Finally found some flex duct that is used for the heat riser coming off of exhaust manifolds up to the aircleaner. It is 18 inches long and 2 inches in diameter. It fits on the outside of the left hand outlets of the heater box and inside the outlet on the right side and inside the defroster tube on the left side. I had to use some tape to secure it on the left hand side but the right hand side fit nicely. They had silver and black availabe. The silver was $4 and the black $8. Just thought that I would put this up in case someone else is searching.
as all mine are cracked. Thanks for posting up your findings. 
Maybe add this info to the Swine Resource thread up top.
