1999 or v

Spotted a weep at the bottom of the radiator on my E320 Estate. It's a 1999/V 3.2 V6 Petrol. MB want over £300 with VAT, GSF are quoting £105+VAT (I reckon some discount should be possible as it's cheaper on their website anyway!). Girl on the phone reckoned it would be a Hella or NRF (?) part...