Gen 2 RSVR Header Sizes

Got an 07 Bold'or RSVR and an 03 RSVR.

The 03 currently has the stock Grey cans fitted, I had been considering coring them out but do have a pair of SP Engineering cans kicking about, so thought using them might be a better idea and keeping the stock cans in the corner.

Anyway, here's the issue, my headers (where they exit into the link pipes) on the 07 are 54mm OD (I seem to remember thats 1.125" ?) but the headers at the same point on the 03 are 57mm OD 1.25").

Is that normal to have two different sizes across the years?

I can't find much on the web about different sized outlets so am wondering if I have some unusual headers dimensions on one of these bikes. I don't really want to buy any new cans and link pipes before knowing what I already have.

After taking a look at a few after market exhaust sites I'm not seeing various options for different year models.....just RSVR 04-08 and being that my current cans on the 03 are stock I'm presuming that the larger of the two are the correct standard size (57mm).......but in that case, what the hell sort of unusual small headers have I got fitted on the 07?? :(

The actual header joints are different on both bikes as well, the 07has a welded ring to stop the can slipping too far down the header whereas the 03 just has the little notches to locate the tailpipes.

Anyone have any idea what the stock width of the header/link pipe should be or what might be going on here?