Hi Ody04,
Sorry, I thought a PM would be easiest. When I mounted the Tusk panniers, I screwed up, big time. I mounted the left side first, only to discover that I mounted it too low, and when I got to the right side, it hit the muffler. By that time, I'd already drilled the holes in both boxes, so it was too late to easily fix. A word to the wise, the Tusk panniers are about 2 1/2" taller than the RE panniers, so that limits where you can position them vertically relative to the rack and pillion seat without hitting the muffler.
There were a couple of options for me at that point. One, get an aftermarket 'shorty' muffler in the hopes it wouldn't interfere with the box (risky bet), or, two. fill the already drilled holes in both panniers (heli-arc weld, screws and nuts, whatever) and start over. Neither option seemed reasonable, so I decided to scrap the whole thing and go with the stock RE panniers. The mounting hardware I made worked great, but the position on the bike was just wrong. Such is prototyping... I may fix the Tusk boxes in the future and send them on, or save them for some other application.
I got the RE panniers at my local dealer, and they bolted up very easily to the RE racks, as you would expect. I don't want to quote the price as they may or may not be available to you at that price. From US dealers, they are all about the same price. I decided that the higher local price was worth the peace of mind of knowing that they were in new condition and I wouldn't have to fight an international shipper if anything happened in transit. I've had several really bad experiences with DHL and they seem to be what everyone in India uses (YMMV).
So, roughly take the (eBay) price from India (with free shipping and without the racks which I already had), add about 25% (+tax thanks to eBay) and that's about what I paid, give or take. Sorry I can't be more exact, but you get the point.
Oldguy Bill