Watch out the different profile doesn't rub (IIRC there is a mod to remove the screw that usually rubs). If the rolling diameter is different it may...
It's simple, check the tyre rated load and compare that with the weight your car puts on each wheel. Buy a tyre that is rated at or above the weight...
Hi mate, ideally you reuse the ends (connectors) or remove 1 connector only, so you void awkward angles to your new hose arrangement to provent kit....
If you are lucky it might be just a plastic connector for a coolant hose (these are brittle and sometimes crack, especially the one near the turbo)....