It took me about 2 weeks to track down the ZZP core, but every cataloug and internet source had nothing that matched the one they sell.
But if you reverse image search the pic of their core it will lead you to the supplier in ch-eye-na. Min 50 per order and if I thought I could pedal enough to cover the cost I'd probably make the order. But it seems to be a hard sell in this community sometimes, as it is I still have a few N* to GenV adaptors from the batch I had made up. Beautifully CNC'd but most of us are still using the old Gen3 it seems.
But if your core isn't leaking you can always use a fin comb to staighten them out, and many do cut down the necks for hose clearance around the alt etc. And the pressure in the IC system is usually around 5psi or less so a leak is not very likely unless you really wigger rig the connections. I usually just use the sping clamps that come factory on most late model GM's.