Rear shocks

[rado561]

Hi guys.On my volvo i have rear shocks which can be filled with air and car can resist to heavy load but the rubber of those shocks got broke. I uninstalled one of the shocks but there is no make on them or serial number probably its because there is a lot of rust on them. I searched if they are stock volvo shocks but i did find nothing. If u know something about those shocks pls tell me where i can find them or what make they are. Every information will be good.