This is a comparison of the two types of 914 output flanges for a 901 gearbox; the 'standard' Non-LSD and a "Limited Slip Differential" https://pbase.com/9146gt/image/144205573
Standard 914-6 (left) and LSD Type (right) - Output Flange Comparison - Photo 1
Standard 914-6 (left) and LSD Type (right) - Output Flange Comparison - Photo 2
Standard 914-6 (left) and LSD Type (right) - Output Flange Comparison - Photo 3
Standard 914-6 (left) and LSD Type (right) - Output Flange Comparison - Photo 4
Standard 914-6 (left) and LSD Type (right) - Output Flange Comparison - Photo 5
914-6 901 LSD Output Flange - Photo 1
914-6 901 LSD Output Flange - Photo 2
914-6 901 Standard Non-LSD Output Flange - Photo 1