Think mine are shot. When I bring to temp 2/3 of water leaks through PF...eventually they hold for a shot or two but iffy to steam milk.
Any suggestions or sources welcome.

1st-line has Ponte Vecchio parts that are a match. My friend scored an old riviera on eBay recently for $ 108. The machine is a beast, and is paired with a Lido 2 gifted from me. She also just ordered a new PV spring that I'll swap in for her. Can't wait to see how the new spring is.
She had looked at Zacconi parts direct from Italy but shipping was outrageous... Go figure.

I think there are different sizes, depending on the age of the machine, and you want to do some measuring.

Mine is older "Flat Top." Not sure if the PV one's are a fit.

I do have the measurements but am hoping to find something stateside due to shipping costs.

I will follow up with 1st line. Thanks for the feed back.