C230 Starter Relay

I'm trying to locate the Starter Relay for my 2003, C230 kompressor, W203.
The fuse box in engine compartment ?
The parts store gave me a green color 5 pin relays as per their computer look up.But the youtube video I watched seems to show a smaller relay.
Relays in the fuse box are lettered I to S so which letter is for starter relay ?
Thanks


