Kinda takes the warm and fuzzy feeling away from getting a brand new rig when you have to jimmy rig it together. They should already know this about it requiring 1/2" and if they are going to sell you the bricks they could at least give you the tapered cuts. Or a pattern. Kinda like when you buy a Woodstove the bricks come cut. This isn't the first rig they have sold. I would call them and tell them to get you the 1/2" right away or find it for you somewhere. If you were a big producer and had their $20,000 RO and needed a part they would had it to you the next day. Why are you any different. Still a customer spending good money. I hope they aren't charging you for the new insulation. It's their mistake not yours