I have a 01 zr2 convertable and I'm needing the plastic channel(gutter) the rear top slides in to, I don't even know what its actually called so having trouble finding it. Any help appreciated.

I don't have any of them, but how about:  "folding top side rail garnish molding".   These are secured to the body with 3 screws.

Where could I fimd this? I've looked on gmpartsdirect.com, thought of hawk but really want to get new ones.

Were they used on the Suzuki version of the ZR2?

If so, try looking here...

https://www.trademotion.com/partlocator/index.cfm?siteid=214330

Worse case scenario... you could go to your local Chevrolet dealership parts department and tell them what you need.  They can bring up diagrams and you can ID the exact part you need then have them give you a printed off quote sheet so you at least have the GM part number, a pic and description. My local Chevy parts department guys will turn their computer screen around and let me look at the diagrams for what I need when I'm searching for something.

I'm thinking that's what ill have to do go to dealership, no luck anywhere online.

Did you try this?
http://www.gmpartsdirect.com/
They are under trucks.

yes, tried there that was the first place i tried.

Yeah.

Last time I saw these available new, they were priced steep.  Like, in the hundreds steep.  I ended up buying a set from someone on this board who'd purchased a hard-top.

Try Hawk, then junkyards.  All 2-door Track/Vits (not Track/Kicks) had the same parts.

Good luck!

ETA:  I think the part numbers may be molded into the pieces themselves.