2017 XC60 T5 PCV maintenance parts list suggestions

[blandis]

I have a 2017 XC60 T5 Dynamic AWD with 104K.

I am going to chance the Engine oil seperator (32140004) simply as preventative maintenance due to mileage. Unsure what is common practice for this replacement (years/mileage)? My plan is to buy OEM Vovlo parts so should have gasket included.

I have a few questions about replacement of additional parts:
1. Do you always do the two crankcase breather hoses 32222162 and 32222163. On my cars in the past if they were no damaged I never replaced them.
2. Do you repalace the PCV valve (31430866) as well as preventative at my mileage of 104K? Any idea of location of this part?
3. Any other componets related to PCV that I should consider replacing?
4. Is a good alternative to use IPD PCV Diagraphram (140903) and Gasket (31359666)? Considerably cheaper($150 savings) than the OEM Volvo.

Any suggestion or feedback is welcomed.

Brad