It's always great to hear that someone likes a product, and since I edit the vendors' list the name "Solvit" sounded familiar. Capt_noonie just opened a website and sells a car seat made by them. She's not yet on the list, so here's a link if anyone's interested. She gives 10% discount to YT members, just PM her.
Three Yorkie Friends Car Seats - Three Yorkie Friends Travel and Lifestyle Accessories