I bought mine from Imotorcyclestore.com , so far they have the best prices I have found on this helmet.
I looked at that kit. All it looks like is a visor with holes drilled in the sides to get access to the screws to adjust the visor.
Last summer I looked at some helmets in Cali when I was back there and you can see the quality in the craftsmanship betwen a pricey helmet and a cheap helmet.
My current helmet is a Shoei, one of the TZR helmets a, I think 4 years old now. I try and replace them every 4 or 5 years.
Currently I'm over in the middle east and bike less until I return to Cali in July. Last summer for 30 days was the only chance I had to ride for a 2 year period.

That sucks!