The oldish thread below gives a parts listing for the above mower - THANK YOU Cyber Jack. Where would I find a piston assembly p/n 7500-201-704?

https://outdoorking-forum.com.au/fo...203-the-deluxe-pope-c1972.html#Post89461

I've had this mower for half a century and managed to keep it going. I don't want the good old thing to go to the tip.

TIA