need 1.25X 4.5X 13.5 firebrick

New to this site,,, very good people and good answers here.. I am in need of some replacement firebrick,,, size is 1.25X4.5X13.5.. These are the bricks that stand verticle in the back.. The ones that lay flat on the floor are 9 " in length.. I could cut some and hope they stay, with cement, but would rather put in one solid brick.. Any ideas for these longer bricks? This is a great sit, thanks in advance.. 13/14 wood already done.. rasp21.

This is a Country Comfort,, 1992 model,,, stove is in really good shape,, just 2 cracked brick that I want to replace, and then the stove os perfect shape,, didn't know that there were non regular size bricks in it, ,rasp.

This manufacturer went out of business a long time ago..

Thanks guys,, I do not know if cementing 2 parts together would hold up long,, thanks for the replys.. rasp