I found the receipt from 15 years ago when my 520H seat spring left side was bought from my local toro dealer. $19.00
This spring my right side seat spring broke. I called Ray (my local toro dealer) and gave him the part number and requested he order me one and hoped they were still available.
He asked what I paid for the seat spring I bought years ago and I told him.
He said prepare yourself........... The price is $98.00 a spring now.
This is how Toro is gouging us now as the parts are getting scarce.
Yes I bought it and my tailbone tells me thanks every time I drive the tractor.