Mulfab changed ownership recently. Mine failed after 14 months and they basically told me the Morgan dealer fitted it wrong we can sell another or rpair it at your cost. I'd avoid them.
I had it rewelded locally & on inspection the top bracket weld was not good enough & not full penetration.

I think you can buy the bit for the top.

I have a plastic rad from a 2014 Roadster that was working that you can hve for free but I see you are very far away.

P.S. you posted this in the CX forum. you should move it to the trad forum.

JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"