Looks pretty nice. Priced respectfully too.
On my quest to find a rear swing arm swap for my 400F I have found that these are relatively close at the pivot point, in addition to Kevin's recommendation of the Honda MC18, the:
Honda MC21 NSR250
Yamaha FZR250R
Suzuki RGV 250K
are all 205mm at the pivot. I have yet to delve into greater detail, such as length. Also a swing arm slightly smaller would work too, like the MC18.
EDIT: Finding information is tough, but fun, and a good learning experience. I did though, take the liberty of doing general searches on eBay, to ask sellers for measurements.