I Recently tore down a CC4125 4-stroke weedeater to thoroughly clean it, and tore the oilpan d gasket in the process. I searched online and it seems no one caries the replacement gasket for it anymore (Part# 791-181018), so I decided to re-draw the gasket in F360 by calibrating a picture of the replacement I found online, and tracing it out.
You can take the DXF I created and print it out as a stencil onto gasket stock sheet(1/16 material is what it should be afaik), or do what I will do and use a laser cutter to cut it out.
It appears this same gasket (and engine design) is used on a number of other brands, from Ryobi, Troybilt, etc. as they were all OEM'd by MTD.