I have a cable kit that uses steel cables that "self-wind" into a 3" coil when the lid is closed. This kit only works with a Mk I as the Mk II deck fouls on the rear cradle before it goes "over-center".
The Mk II can use the gas strut kit Dennis Olthoff had made as can the Mk I. My cable kit does not assit the deck lid in opening, it only prevents the Mk I lid from going over center and falling off/crashing to the ground, other assorted bad outcomes.
The advantage to my cable kit as opposed to the original type cables is they are self storing and cannot become fouled in the halfshafts, etc.