There’s a lot of EV kits and also people converting petrol cars for a living, f.e. this little beetle:
https://youtu.be/kYmMrMEwl94?t=282

Just search for <Car maker> <Car model> <Car model year> EV Conversion Kit and you’ll find a lot of hits such as the first hit on duckduckgo for VW Golf 2005 EV Conversion Kit that may be bought with or without installation:
https://ev-evolution.eu/solution/volkswagen-golf-ev-conversion-kit/

EV Conversion Kits is probably your best bet.

As gardenfork always says; Done is better than perfect.

The days are finally longer than the nights and I’m starting to see grass underneath the snow. I’m looking forward to start working in the vegetable garden and being able to have a nice cup of tea outside in the sun.