The corners frankly, don't mater, just one thing I would recommend "smoked" corners just so that the "white" doesn't stand out as much.
As far as tails go, I bought similar ones and I had to modify them because even though the picture showed nothing mine came with the stupid orange bulb housing. Cheap aftermarket tails won't be a "perfect" fit either. And the housing of it I had to modify a lot to get all the bulbs to go in nice and smooth. If I had to do it over, I would have bought some depo tails or some OE ones... just my 2 cents