Preway B142-EM Type C Firebrick Replacement Issue

[49er11]

Hi,

I have a Preway Zero Clearance B142-EM Type C fireplace with cracked firebricks that need replacing. My issue is that the back wall is fitted with bricks that are larger than the standard 9"x4" that I've been finding online. My bricks are all over 10"x10" and stacked in two rows of three. I can't seem to find the manual online and assume the business has closed since there is so little information online about them. Any advice on what would be the best option to replace them? I have attached pictures. Thanks for any tips.

 

[begreen]

The bricks are cracked, but not crumbling yet. They may make it for a few more seasons if treated nicely. refractory cement could be used to repair them.
Large firebrick is sold, though they may need to be cut down to fit. Here is one source.

Firebrick Tiles and Large Sizes

 

[49er11]

The bricks are cracked, but not crumbling yet. They may make it for a few more seasons if treated nicely. refractory cement could be used to repair them.
Large firebrick is sold, though they may need to be cut down to fit. Here is one source.

Firebrick Tiles and Large Sizes

Thank you for the link. I was worried I might have to cut them myself because I'm worried about getting a perfect cut with a skilsaw. I do have some of that Rutland's caulking so maybe I'll use that to try and get me through the season. Thanks for the reply.