The seals I have got from Mario in the past have been excellent. I believe by there colour they are a viton seal. Viton seals are normally a brown colour and are superior to normal rubber seals. As mentioned and what i have always done . Replace the seal, replace the flange. Not that expensive and it is a part of your vehicle you do not want to revisit to often.
Cheers Hall
Oh and Mario I will be soon buying those seals and flanges for my Disco.

