I have a black 301 short bed that came in a cabinet. Seems that the short bed was the cabinet machine and the long bed was the portable machine....so look for a cabinet with the correct size opening and metal holder (drat -don't remember the word, but the machine sits down in a metal "base" inside the cabinet opening.)
The 301 is a sweet machine, but it uses the Featherweight size bobbin, which holds much less thread than the standard "15" bobbin most machines seem to use now. Just wind two or three at a time!