[928uk] 928 GT rear decal

[Rodney Smith via 928uk]

Hi,
My 1989 GT in Baltic Blue has a decal on the rear beneath the big PORSCHE letters. It’s faded and almost invisible. It is the same colour as the body but it looks like the top half of the decal might have come off. When you run your fingers over it it is raised above the paint surface by a bit of a mill. 
I got a replacement from Porsche Shop which looks to be the correct size - but it’s white! What colour should the decal be? White, black, body colour?
Rod Smith