I have been using HF filters on all my bikes for at least past 15 years. For the r1200 lc bikes HF specifies their HF160 filter. However, I have two leftover HF164s from my previous hexhead and I am wondering if I could use them? I understand that new RSs came with the original/shorter hexhead filter?
To be honest with you for the small increase in cost I would use genuine parts. If you are to use after-market filters then fit the correct one don't use one with the wrong part number the flow rate of the filter could be wrong and could possibly starve the engine of oil. Just not worth the risk in my opinion.