Anyone knowledgeable w/Airens LM21SW 21" mower??

After doing my research I finally decided to purchase the above referenced mower. However, after delivery and a few uses I noticed a few items that were referenced in the generic manual that were NOT on my unit. It appears that the dealer took a model LM21S and added the swivel wheels to the front in essence to "convert it" to the LM21SW.
My question is this: Does anyone know what the EXACT differences are between these two models part for part? My model is a 911533 which does NOT coincide with the manual for the LW2SW.
All things being equal, the unit works and mows just fine and I am really happy with it. I just need to know if I am being ripped off or not.
Thanks in advance to anyone who can respond to this question.
Bob
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do work for areins dealer,,they said the front wheels were only difference,
http://www.minibite.com/america/malone.htm
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