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Ecommerce - Linking Buttons to Individual Product Pages

I have a 5 product ecommerce site.

On the product template, I have a side nav with 5 buttons which I would like to link to the their respect product page.

Finally I would like to change the bg colour based on their “Current” state.

This is simple with normal pages, but I cant figure it out with product pages. Any help?

My only thought so far is to use direct links, manually copied from the url.
These will then have to be updated from the staging domain to main domain when the site is launched. And I also seem to lose the ability to edit the current state.

Any help would be really appreciated… Thanks!