I'm thinking of getting another spring kit for my New Agent and figured that I may as well get one for my Tactical Officer's Lightweight. It is marked Lightweight Officer's ACP on the other side of the slide.
It no longer has the "flat-head" type plunger so I'm not sure what is on it now or if the slide was milled for the current guide rod.
ETA: It looks similar to this one.

Crap! I can't believe I forgot to insert the Link! I'm ccoking dinner so forgive me, guys!
Spring kit

That EGW parts you linked to has Clark Custom plug which directly replace OEM plug. It will only work if your frame has not been modified. Likely if your pistol has other aftermarket recoil system, it was modified. But a clear photo with slide disassembled will help confirm that.

I think EGW makes one for that gun , I know Kimber Ultra Carry and I think agent are different than Officer model

That's the thing, I'm not sure if mine has been modified. It has a FLGR but I can't remember what it looks like under the dust cover. I don't have it handy right now tp check. How obvious is it to see if it was milled out?

I have the Kimber spring kit since I could never find the Colt one in stock for the New Agent. The Kimber one is much stouter built than the Colt one and I'm very happy with it. I just wanted to try out the EGW one since they advertise a longer spring life.