On the 02 the nipples are separate and you use the old ones.You talking about the 2 short nipples that are brazed into the core? If so...they come with the new core. As someone else said you'll still have and old core and you should replace it.
I have changed the core. I had the oily steam windshield and replaced the core and after putting it all back together found it was leaking worse. Took it back apart and found the cracked tube. I wish the tubes were connected. Then everything would be new. Thanks. Jim