In my 1920s house I have a large fireplace where the whole of the original fireplace, including the fireback, has ben removed. I've got a rectangular fire basket so I'm planning to build up the sides with fire bricks. What mortar do I need, any particular mix? Secondly I'd like to match the front of a fire place in another room that's built with bricks that are approx 2x 1 x 4 inches. Any idea if anything like that is made these days? Any suggestions welcome!