Vevor vs YONG HENG 4500 PSI Compressor

I have a 3 year old Vevor two stage 4500 compressor. It looks just like the Yong Heng but the upper high compression rod or piston as some call it is smaller as you 

can not use the same ring seals. They look alike but the Vevor is just smaller & it is hard finding seal rings. I should have bought the Yong Heng my mistake. Now from 

what I under stand Yong Heng is using a different seal in the newer models then they were back then. I will most likely buy a Yong Heng is the future but can't just now. 

I just bought a AEA big bore 35 cal & my wife went off on me. You guys know the deal, so I must fix what I have for now. Do any of you know who sells Vevor upper seal piston rings?

They show those early seals on e-bay but they do not say the size so .I took a shot & ordered some But have not got them in yet. If they are not would a Yong Heng upper end 

fit? The crankcase looks the same.

Fly