Having a Gravity Form accept data from a previous non-Gravity form

Hopefully I explain this right.

We have a website with products. These product pages were built using the ACF plugin (advanced custom fields). The pages look pretty nice. You pick options that modify price, etc.

What I'm trying to do is take data entered in this form and pass it to the next form which is a Gravity contact form. If both forms were designed with Gravity, I know this wouldn't be a problem. But that isn't the case. Is it possible to take data entered in a non-Gravity Form and pass it to a hidden field(s) (or textbox) in a Gravity Form?

This seems to work perfectly with parameters with no spaces. Is there a special format or syntax to slap in a parameter name with a space?

I know the query string URL puts pluses instead of spaces, but that didn't work either.