Rear Brake disc info

[jl34]

Hi All

I just purchased some Grooved Rear discs for my 3R from a South west Lotus and i was told the discs were genuine AP. However, they came , slightly rusty, without any boxes from AP , or brand marks at all, the centre hub was painted silver with lots of overspray. They looked like something from China not Leamington Spa.

Before i talk to them i was keen to understand if there is a way i can identify if they are genuine AP? also does anyone know the rear AP part number (only the fronts are in the Noble wiki).They cost £200 each with Vat so not exactly £50 specials!

thanks all