While we are not the makers of those stools, we do carry two industrial stools that have similar styles. Both stools have adjustable seats. While the Industrial Factory Backless stool is sleeker in it's design, you might be suited to the Industrial Metal Adjustable stool (don't you just love the original naming?). I'll post links for your convenience: http://www.barnlightelectric.com/industrial-decor/industrial-factory-stools/industrial-factory-backless-work-stool http://www.barnlightelectric.com/industrial-decor/industrial-home-utility/metal-stool-with-adjustable-top

Yes, I was hoping that they would post photo on here, as they have a lot of beautiful bathrooms on this site, but it is a recent one, so they havent posted yet and I think they will be closed over this period, when a lot of sales are on...I have sold my car yesterday and so now have the funds to finally get my bathroom reno progressed...yay!

check under "metal fabricators" in your local area ... this would need to be custom made to suit your stairs and if you're working with a builder they should be able to recommend a preferred company