this thread's a bit old now I know.
I've heard some pretty bad things abou Integy's Aluminum, very easy to bend.
Check with these guys:
Golden Horizon Enterprises Co., LTD
#311-938 Howe Street
Canada V6Z 1N9 Hours of operation are 9am to 6pm
Monday thru Saturday
(for technical and dealer questions)
Phone Orders: 604.767.8522
(for online order questions or to place an order)
They're from the LM, Vancouver to be specific...
I'm not sure if they make what you need, but they might be able to if they don't already. I've got f/r carriers and f casters from them and they're great.