I bought the OEM racks for the OEM panniers. The left side rack had a manufacturing flaw that made it very difficult to attach. It was not off just a "little". Quite simply, the holes did not match up. I do not have a GIVI rack, but I have GIVI drop bars. They are made with what could be considered "expected" precision -- meaning you can simply bolt them on without using a vice, blow torch, profanities, etc. The GIVI drop bars are made with impressive quality, fit and finish. The RE pannier racks -- not so much. Even the welds are ugly. After installing them (I have a little "machine shop" and made it work) I mentioned to my wife "It's kind of amazing they can make an engine that even starts!" I was not amused. Expect that the RE OEM racks may off center, too.
The panniers themselves are very nice I must say! I assume they had a vendor manufacture those. They do not have the classic RE "organic" precision factor.
(P.S. I do like my RE Himalayan btw! I find it's shoddy construction and quirks amusing. It is like tinkering with a bike that was made in East Germany before German reunification. It's a blast. But for any after marked accessories, if YOU are installing them, I would recommend buying from other modern vendors).
Good luck!