Pack-rack models?

[wezo]

So are they model specific. had one on my SV650 but sold the bike, kept the rack frame. Have a Ducati 900ss now.

[Virago]

Most pack rack systems have standard racks, but with model-specific mounting brackets. You may be able to source brackets to suit.

[cs363]

The L brackets are model specific, the pack frames fit quite a few different models though there are about 5 or 6 (or more!) different width's of them to fit different model bikes.
If you're lucky there should be a part number stamped on the pack frame or on the later ones a sticker with a number like PF6 or PF14 etc., some just have the number.
Otherwise check out their website http://www.ventura-bike.com and you should be able to suss it out. Just go to fitments and click on the relevant make & model and it shows all the parts that fit each bike.

[Highlander]

We have two bikes with them fitted and they are quite different widths. No way they would be interchangable in our case, you may have fluked it though.