help me id these rails?

I recently purchased a first gen extended cab which came with a SnugTop and rails already installed. This is good because I needed both so it's saved me a few steps.

I can't figure out what these rails or mounts these are. I assume Yakima, but I haven't found anything on their site that looks like this. They're probably pretty old which is making it harder to locate.

Do these look familiar to anyone?

 

Snugtop uses Yakima tracks on their caps (I'm not sure if this has always been the case, it's possible they've changed over the years). It doesn't really matter either way, because the yakima and thule tracks are interchangeable.

Those mounts in your tracks look like the Thule tracker mounts (I think they're called TK1), photo below:

 

Awesome, thanks so much! I'm gonna get started building out my camper setup. I'll be mounting a roof box and DIY shower to rails as soon as I get the parts.

 

Nice! Etrailer is a great resource for spare and small parts for all those racks.