Hi Norm,
I'm not sure if he makes stacks for others or not. I tried finding his site again quickly, but in the short time, I couldn't find anything.
I had to use a Dremel to get things flush, but because I'm not a pro modeler, I used JB Weld to secure it on the boiler along with a small level. The hole for the smoke unit remained b/c I didn't want to make any "under the hood" modifications. From a distance, I 'm pleased. I made my own weathering look to the boiler front area with Neolube and chalk.