I wouldn't bother trying to find lowers in your colour, they're so rare, as are the little air scoops.
As you've got the fittings, get some of these, no more expensive than 2nd hand lowers, but made in GRP I think. So much tougher than OEM lowers.
You'll need to get them sprayed, but that's what I had to do when I bought my lowers, silver ones are uber rare, so I got OEM blue ones sprayed.
I'm going to get some of these, as my lowers broke round the rear mount & are impossible to fix
http://www.ebay.co.uk/itm/1509973633...%3AMEBIDX%3AIT