Our NU2US Trailmanor had the same curtain problem our previous Trailmanor had...broken curtain slide clips.

I have been unable to find exact replacement clips. But, I found these clips (see my Amazon Associate Link below) and with a little bit of sewing on a standard sewing machine our curtain problem was solved. Certainly not an exact replacement, but they work well and frankly we can't tell which clips were replaced using these clips.

I use Dupont silicone spray on the old plastic curtain tape and also spray the needle before I sew. This helps to prevent thread breakage.

Amazon link for the clips (14 per pack):
https://amzn.to/3tgPzMw

Silicone spray (what I use): https://amzn.to/3DTrKzh