TY for the link tho didn't really give me any new info.

To answer my own question, yes Cossie & iS standard injectors are 75mm in size.

Also got some info on the required resistance and at least in theory 3 ohms isn't enough. I'm probably gonna order bigger resistors AND mathcing high resistance injectors and gonna try the resistors first only if it fails I'm going to try with the different injectors.