A search of the manufacturer's website reveals that these are only made in the classic black and grey colors. However, if you feel the need to make these match a specific chair color scheme or decor you could get some plastic primer and paint the cover and/or "hub cap" area. Plastic primer would allow you to use another type of paint on top of it if you can't find the specific color you're looking for in a plastic paint.
We used these rubber office chair wheels to protect the inexpensive laminate floor put down in the house we were renting. They worked very well in keeping marks and wheel ruts off of that type of flooring, so they'd probably work just as well on vinyl plank flooring.
I just listed my disappointment because the wheels were not made of RUBBER, at least not rubber that would roll across the floor without making all the clanking noise. Very shocked that RUBBER could possibly be used in the listing of the product.
I had to order online and pick up at the store.
They are very squeaky and loud. They are just as loud as the plastic wheels that came with the chair but also very squeaky.
Diameter measures .430"
Do you mean can the stem itself be rectangular? I don’t know about that. But this stem snapped into our chair legs, and has been working as promised for last 2 years
If I were you, I would first inset metal posts into the bottom of each leg and really secure them. The post should be the width of the posts on the casters you purchase. Once you order those casters and receive them remove the post attached to the caster and insert the postless caster into the metal post that you inserted into each leg.On second thought this is too complicated and you need to find way to hold the caster posts to the bottom of each chair leg. Probably drilling a hole to the size of the caster post and then gluing the carter post would be simplest.