Found a Whiteline "Factory Second" page.
I hope this is not against any rules...
I was messing around on Ebay and came accross a seller titled "WhitelineSalesOutlet". It appears to be "factory second", or blemished Whiteline products that they sell directly at a discounted rate.
One item they have listed is a front arm/chassis brace for the twins. Price seems very good for a Whiteline product, check it out:
whitelinesalesoutlet on eBay
The reviews are all positive, but there really aren't that many of them.