There are three types of springs shown as various options that can be used for the Classic Mini. Standard road, fast road or rally and race applications.
If using these on 10" wheels with HILOS cut 3/4" off the end of the center threaded bolt of the old type HILO with a circlip as it will bottom out on the cone spring face and the car will sit high. For extremely lowered cars the HILO face will also need machining a few mm.
Like all rubber products -they only have a certain shelf life. Sold singly but advise fitting in pairs.