I have the original SR60, purchased about a year after Grado started manufacturing headphones.
I recently got back into headphone listening in a big way, after decades of low interest. My old Grados still sound very good to me. The ear pads needed replacement (no surprise there). I decided to try third-party. The first pair I bought were dirt cheap but uncomfortable, kind of stiff. I tried a friend's RS2e pads, but the dense foam was even more uncomfortable. I liked the hole in the center however, so I looked around and found these from WinnerEco:
https://www.amazon.com/gp/product/B06Y2XP91L/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1
They are awesome for the price! Very comfortable compared to anything else I tried, and they sound better too. They are also quite resistant to picking up dust, hair, etc. I highly recommend them to anyone with Grado Prestige. If anyone gives these a try, I'd be interested to hear your opinions.
I thought I'd also give their G-cushions a try. They do not recommend these for Prestige series, but I thought it was worth investigating. They don't suit the SR60 at all, the sound deteriorated quite noticeably.
Disclaimer: I have no relationship with WinnerEco, just a happy customer.