Yes RU0370 is 1.75". The original metal can filter measured 1.6".Interesting. That one has a 1.75" flange ID. The one I use has a 1.5" flange ID.
As Stu said, you should measure your intake diameter and make sure you get a filter to fit. The K&N website has the ability to filter by several criteria.
Mine fit no problem. Didn't require much clamp tightening, and it's snug.