Hi, in my fiat 850 sport coupé the heating pipes in the central tunnel need to be changed as the tips of the pipes left under the car are all corroded and falling apart and there isn't much material to grab the rubber hose onto.
They're held in places by 4 spot-welded brackets, I tried drilling away the weld but it looks like it is becoming even more messy and I'm literally destroying the brackets; all this and I'm not even sure if I will be able to get the old pipes out and the new ones (custom made) in.

P.S. My car is completely assembled, I just removed the seat, carpets, heater matrix and the dashboard.

Hope someone can help me as it's 3 days that I'm stuck at this point.