Need Help with K-line Porter Steam Engine

If you can't find a replacement, just a suggestion. Measure and see what engines are similar and maybe see if a replacement from another engine Lionel has maybe purchase from there parts dept.

2nd solution is to make your own from plastic and rivet decals.

I made one decades ago for a "N" scale engine had a broken boiler front end and none were available.

with your skills, i know you can.