opinion and help on this two brush restoration

[rocarule]

So i have this two ruberset brushes that i am restoring and i would like to know what do you think of the short one



Having said that the second one has its rubber ring in a not so great condition and i would like to replace. now the question is is there a way to source an aluminum ring that matches the original in size? can it be made? By who?

Thanks in advance.