Just got back from Paris! and I have an update for mini rectangulars. First, I booked an appt a 19 Rue Cambon for 10:00 am (opening) and 31 Rue Cambon at 11:30 am. Believe it or not, I found minis at my first appt (19 Rue Cambon). I was shocked because I had prepared myself to go to every shop, had an appt for every single one too lol. So they had a pink mini rec ghw, yellow ghw (I think, see photo) , and greeny blue, I'd say turquoise color champagne hardware.
I called printemps cause I had an appt there right after and they have a bunch of color as well, I can't remember exactly but they had good stock. I also went to 51 montaigne store they had a grey.
My advice is start with the rue cambon stores, go early, book appts & call around while your there if they have stock specifically the department stores to see what your options are before you purchase and just be 100% sure. Hopefully stock is good when you guys go.
I ended up going with the turquoise. Goodluck!!!