TRF511 arms question??

[rcaddict]

Can somebody tell me what are the part numbers for the front and rear arms everyone is using for racing their 511's. I remember reading somewhere that the stock arms are no good because they are too weak and break, and that I should switch them out for stronger ones that Tamiya makes. The only problem is I dont know which ones are the best ones?? Can someone please give me the part numbers for the super strong arms for front and rear for TRF511. Thanks for the help!