I brought up the aluminum overflow to Noel at SSITS when my stock one broke the nipple off and caused me to miss the only ride I signed up for. I repaired mine better than factory but will be looking forward to see what they look like.
I would recommend facing the return nipple forward on the tank instead of out the side.
I have my own thoughts as to why my bottle broke, and I have since repaired it to alleviate future issues.
Stephen