As far as I am aware all Akrapovic cans of the same shape are the same, they are not specifically made per model so this widens the net a little to any oval 60mm Akrapovic inlet can. So within those parameters there's carbon and titanium for materials and 'SP' series which has the baffle and therefore road legal (when fitted) or the race series which is without baffle and stamped 'not for road use' on the rear strap.
Also needed is a hanging strap and at least two springs. That just leaves the link pipe. There are two versions, stainless and titanium.
So with some patience the lot can be purchased separately, which is what I did. I paid £200 for a good can, £100 for a (unused/new) titanium link pipe, £8 per spring and about £20-30 for a carbon strap if I recall, so despite being used it still wasn't cheap. Well worth it though, I'd pay it again if I had to.
Hope this helps and good luck.