Thanks, guys. I appreciate the comments.
Brian, the stack is actually the same length as the one from the kit. It was a one-for-one swap. Now I just have to figure put how to make the curved stack to replace the solid one on the Autocar dump.
Just finished up the AMT Autocar A64B tractor kit:
The build is mostly box-stock except for the 3-D printed interior door handles & window cranks:
The exhaust was replaced with 5/16" aluminum tube, and the glad hand airlines are #22 black wire. Decals are from the AMT/Ertl International Paystar5000 Cement Mixer. Color is Testors Dark Red. AC lines are some small black wire from a broken USB cable. Hydraulic tank is from the AMT/Ertl Dump Trailer.
Thanks for looking.