You may find interest in contacting Louisville Firebrick. They are the same company which once produced "American Security Archbrick". They can be reached here: http://www.louisvillefirebrick.com/
All but one size of the original middle and side archbrick sizes are still available.
It is not but 5-10% more expensive to purchase brick rather make ones own. ALSO, without the brick being properly "cured" in an oven it will be rapidly degraded by the sulfur in coal.
i have hundreds of original engineering correspondence letters from ingersol rand to various other locomotive mfg and development of deisel, steam, engines as well as transformers etc. also hundreds of original photos. I am looking for an interested party. THIS IS A VERITABLE TROVE OF DOCUMENTS AND CORRESPONDENCE.
call me 201 444 0887, charlie
Nice to see 1630 is well on her way to run again. However i herd a rummor that UP might plan a excurision next year with 844 running to union is there any possible of that happening or are the bridges on the UP line two heavy?