Many other arms will fit, but the angle of the arms are different from the Mark II. You would have to find something close to each other to make it even close to looking and swiping right. Since they are stainless steel you can usually brush clean them, but only use stainless wire brushes as iron brushes leave iron bits in the cleaned surface and they will rust-up overnight. We found this out when a supposedly stainless sculpture we bought rusted overnight.
Barry Wolk
Farmington Hills, MI
C5681126