FSA headset cup depth

I've been having all sorts of problems getting a headset for a Giant Reign - the original is an OEM model which canot be bougfht aftermarket.
After much research, trawling of website I ended up talking to Giant aftersales team, they have told me that the FSA Orbit ZS-3 is the correct headset for a Giant Reign.
However, I know the 'S' in ZS-3 stands for shallow as in the cups but I went ahead and ordered one anyway. Now it has arrived, the cups are noticibly shallower than the originals I have removed.
They have seated fine, but there was obviuosly a good reason as to why the original headset had deeper cups - so do I contiue with the shallow cups or carry on with my elusive search of a Reign headset?
I'm more concerned about cracking my headtube and impailing myself as the new cups down go in as far as the old ones - any thoughts?
After much research, trawling of website I ended up talking to Giant aftersales team, they have told me that the FSA Orbit ZS-3 is the correct headset for a Giant Reign.
However, I know the 'S' in ZS-3 stands for shallow as in the cups but I went ahead and ordered one anyway. Now it has arrived, the cups are noticibly shallower than the originals I have removed.
They have seated fine, but there was obviuosly a good reason as to why the original headset had deeper cups - so do I contiue with the shallow cups or carry on with my elusive search of a Reign headset?
I'm more concerned about cracking my headtube and impailing myself as the new cups down go in as far as the old ones - any thoughts?
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FSA do have a pdf with all the info on their webby.
8mm for the non tapered sides is a number floating in my head.
Parktools :?:SheldonBrown
I have just ordered yet another headset with deeper cups, hopefully between the 2 I'll be able to bodger one together.
I'm sure the shallow cups will be fine but I'd always have that naging feeling that I'm goona launch off a drop and find my headtube ripped off.
I have all email correspondance with Giant sop I'm sure I could prove liability on them if something did go wrong - however, I just want my bike to be right, so I can be confident with it. I've just come back from Morzine / Les Gets where I did the shed drop in the kona bike park - it didn't go well but I dont think I'd even consider it if I had any doubts about my bike.
Youth
btw thats one sweet looking Anthem!
Thanks for compliment on the bike, it looks slightly better now that ive put 2008 xt on it....just need santa to bring me my crossmax sl/slr's..ive been good if your reading this
Youth