Yes, but welded aluminum that has been post-weld heat-treated. I believe as well, that its 6061 aluminum so cold-bending would likely crack it, or start a fatigue cracking process. I would suggest just using spacers. Sounds like a few mm on each side. Use a good quality bolt. I have a Blackburn and most of the weight is supported by the seat stay eyelets, so the longer bolt plus spacers should be just fine.

If you had to bend 6061, you would need to heat it with a torch.

Ahhhh. A zombie thread! I was sucked in!