I just did a Partzilla parts list and for all rubber parts minus the hoses which are aftermarket on my 14. The total comes to just under $350.

This starts to make aftermarket brakes look even better. I wouldn't bother with replacing any OEM rubber parts if they are just going to sit in a box soaking in fluid.

Even more so when front/rear brake and clutch stainless steel lines will set you back by a total of $300 if you order directly from the manufacturer and in my opinion there's much better feedback from these lines than the rubber OEM ones.

https://spieglerusa.com/brakes/brake-lines-accessories-tools/cycle-brake-line-kits/make/kawasaki/model/zx-14-/year/2008.html

If you shop around could probably find the same parts for a bit cheaper, Revzilla for example charges the same for the clutch, but their brake kit (none listed for the 2008 but there is one for the 2012) is the same price for the front/rear as Spiegler is for just the front...