Help with Negative Masks for Leitz IIC

I have a Leitz IIC but all but the 35 mm negative mask were lost in moving. I can get new masks from Leitz but not in the formats I need,

2-1/4 x 2-1/4, 6 x 7, etc. If I had a GOOD tracing of the outside of the mask and the opening I could have another format modified by a friend of mine to match the originals I need. The reason the tracing will be helpful is to allow me to use the film guide rails on the edge of the carrier which are designed to line up with the respective opening of the mask and the edge of the film. Any help with this would be greatly appreciated and I would be happy to compensate if necessary for all the trouble. Later...Will