I have an '85 Custom Cruiser that had the three windows on the passenger side shot out by some kids with a BB gun. I went to a salvage yard & got replacement window glass for the front & rear R/H doors out of a similiar vehicle. The car I got the windows from had manual, roll up windows; my car has power windows. Will I have to change out the metal channel that the glass sits in (that bolts to the regulator)? Any pitfalls to watch out for? Any advice here is much appreciated-I am not an experienced auto glass kind of guy...