The answer, sadly, is no, it won't fit without making some dents in the fender. We opted to replace the TR4 intake with a TR3A intake ($50, polished) sourced from ebay to avoid having to mangle the fenders and/or the new air filters (when we got it, it didn't have air filters).
By mistake, my Father ordered the smaller H4 carb filters. We modified (drilled) these to fit the HS6. After seeing how close to the fender they sit, I'm glad we didn't get the (slightly) larger filters.