As title.

I have a mk2 Astra merit in midnight blue with SRi bumpers on it and i was rear ended the other night and need a new rear bumper. There are 2 on Ebay at the minute which look similiar in colour but the seller is at a loss as to which blue's they are painted in. Anyone know how many different blue paints vauxhall used on the SRi 87-91 ?

Bit of a long shot i know but someone might know.