Polk Monitor 7 crossover upgrade question

I am trying to teach myself how to recap and see lots of different information online. I have been reading posts on this forum and understand that Sonicap is who to use. The stock crossover has a 3.4uf Electrolytic cap on it and I was wanting to know if I can change it out with a film cap or do I keep it Electrolytic? I apologize if this is a question already asked and answered on the forum. I am looking at using the Gen 1 Sonicap capacitors and Mills resistors. Also it looks like I can use a Mills .5ohm for the poly switch replacement? Thank you guys in advance.