It's usually always a good idea to replace hardware on every change. Or that's what I do. Super cheap at a local part place.
The slide pins you can easily just pull them out clean them off and relube them. Just make sure they're not seized is all. Quick tip don't over tighten the bolt that goes in the slide pin lolol
The type of lube is a bit of a debate with some people but I use this. As long as it's silicone based as that won't hurt the rubber boots.
https://www.amazon.com/CRC-05361-Si...liper+grease&qid=1558103743&s=gateway&sr=8-13