I am in the process of converting my 04 ProX2 into a 136". Purchased the kit from Tracks USA with a 136x1.5 Camoplast Intense track. Bruce from Tracks USA told me I would have to notch out the lugs that are inline with the windows in order to get enough clearance for the heat exchangers. Is this true? If so, how much do I have to notch out? Any advice would be appreciated--thanks.