A few people have been scammed on the site, Only use paypal to pay for items for sale by other members. If they will not use paypal, its likely a scam NEVER SEND E-TRANSFERS OF ANY KIND.
I ordered these 25mm risers from Germany. I didn’t want go over 1 inch because I didn’t want to mess with hoses and cables. These risers also moved the bars 1/2 inch closer to me. I received them in less then a week after ordering them.
I went with SW-Motech Bar Back which raise the bars a little over 1 inch (30mm) and brings them back about .8 of an inch (21mm). I had the dealer do it as I had the same concerns as you and changing cables beyond my skill set. They were able to install without rerouting any cables. Looking at brake cable there was not a mm to spare.