Get the ru 1700. Same filter dimensions as the 600 with an angled flange.
When I did my pods I bought 2 600's and 2 1700's and then took my bike apart. I was not sure which I would use but wanted to have both on hand for the least amount of downtime. The 600 ended up being the best fit for me. Instead of the exhaust tube thing some ppl do to hold the filter in, I put a very small film of rtv on the rubber flanges before sliding them together and then used 3 #4 wood screws (just long enough to grab both layers) evenly spaced around the outside of the rubber boot. The rtv sealed it and the screws keep it all in place, to remove it for cleaning I just take the boot off at the carb. Now to the reason for the filter choice. Though k&n lists the same flange size for both filters, I found the 1700 flange to be slightly smaller, and not seal up as well inside the factory carb boot.