I know the Sierra Cosworth pump is used as an upgrade for Escort RS Turbo's (like the Bosch 0580254941), but I rememberd I heard that its not as easy as just switching this one with the standard RS Turbo pump?!

The nipple at one side on the Sierra Cosworth pump is larger that the one on your standard RS Turbo fuel line ??

Can somebody confirm this? Perhaps a hint where and what to buy to make this work?