Hi Tom;
I know what product you are referring to – I used these when building my Tich. No, I don't have any more!
I did read somewhere where they were made of soft material that wore quickly. Maybe not the best choice?
The normal cast hornblocks (which I've used in my soon-to-be-completed 3-1/2" gauge 2-6-0) seem fine and took just a little bit more machining (for the "bolting face", I just used the pressed ones as-is, as I remember it).
Good luck with your Tich; JohnS.