The coolant reservoir cap on the square style reservoir is from a Mini/Land Rover (Defender too I think)
Source for the reservoir I'm not sure on.
Globe/Ball reservoir is from VW I believe.
Switches are from a lorry/bus of sorts.
Heater valve switch appears to be a universal generic part
https://www.ebay.com/itm/Heater-Valv...4/153177204100
![]()