Firstly yes those will fit an RS. Ignore the photo at the top of that page as they have stuck the wrong one on it.
To try and clear up some of the confusion (and hopefully not make it worse
Option 1 - Givi PLX770's
- Made by Givi to fit the V35 hard cases to a RS/ST/GS
- You have to relocate the indicators.
- The brackets comes with the indicator relocation kit
- Kit relocate the indicators onto the rear fender - needs extra wiring and can look a bit naff.
- (I got mini-led indicators instead and mounted those to the rear fender.)
- 3 normal bolts/nuts on each side to remove the brackets if needed.
- Cheaper than the Can-am brackets*
Option 2 - Can-am Brackets
- Made by Can-am to fit there own hard cases (which are the same as V35's) to a RS/ST/GS
- You can use them with V35's as they have the same mounting system.
- You have to relocate the indicators
- The relocation kit can be sold as a separate item so you need to be careful when ordering to make sure you get both.
- The kit relocate the indicators further back but still on the top part of the Spyder (i.e. not the rear fender)
- 3 quick release bolts on each side to remove the brackets if needed.
- More expensive than the Givi brackets*
* I'm not sure how much price difference there is in the US. Here the Can-am ones were 2 and 1/2 times more expensive which is why I went for the Givi ones. However the markup on anything Can-am here is ridiculous.
Picture of the Givi ones on my RS...and yes I know it needs a clean, it's winter here remember

)