Rev 1 struts should be rebuildable i.e.

you can replace the inserts.

Tcb do them for

£25 each, and you'll want to do both sides.

Otherwise you can use any rev, n/a or turbo but be aware that turbos have black bilstein shocks and stiffer springs.

Always replace both sides at the same time and if getting new then do the rears also as new up front

and tired old at the rear will give some crazy handling