drummer, i have had enough issues with parts stores that i usually look in there computers myself now. i have found that there system is very flawed. many parts in there for our SC really is not for our car. that was 50% of your problem. the other 50% was you went to a female for technical information. not to be or even sound like a sexist, just using facts, females are generally horrible at technical and mechanical skills and have a tendency to lack the physical ability aswell. due to affirmative action employers have no choice but to hire them in positions that they are really not qualified for. this is in most cases but not all. i have found some females that do very well but thats very few times.
so in reply to your comment of having to ask everything on this forum, well yes. for most everything i recommend using the search and or posting a thread before going forth with any actions of which had been explained to you by people that havent the slightest clue about our cars. on the mn12 platform alone most people in here have 10+ years with these cars. some people up to 20years. so you will find its very very rare to get a wrong answer from most in this forum.
im sorry you had problems, but next time just ask. i have a nice heated garage that i would have been happy to walk right up and get the part number off of the belt for you. and im sure there are many others here that would do the same.
also after burning belts(if it got hot at all) sometimes you will get some belt carbon filled in the grooves of your pulleys, you might want to check them to make sure they are clean or you could ruin your new belt.