The stock brembo front discs for the big brake conversion (brembo) are drilled discs. If you want a matching DRILLED disc, there are plenty of options, but IMO drilled discs are a mistake as they WILL crack and fillup with brake dust!
If you have grooved discs currently on the front and want a matching groved rear disc (as you ask in your OP) then I would say try the EBC ultramax. I currently have the fronts in Big brembo size with the ferrodo ds2500 race pads and they are nothing short of excellent as much as an improvment on the stock brembo stuff as the stock brembo stuff was on well stock! ! (If you see what i mean!)
No warping issues yet and done 3k miles on them, the brembo stock drilled discs had been skimmed by this point!