I've had that problem before. The diaphragm on the left doesn't fit because of the eye-of-the-needle pull-rod, I think they probably fit Holden Red Motor lift-pumps though. The correct one on the right also fits some Perkins engines, so this may help your quest for parts. The pull-rod oilseals are quite interchangeable, the one on the right is secured by the round plate and peened inside the housing while the one on the left is secured by a large thin washer and the big spring outside the housing. My problem was a little compounded by the fact that the pull-rod seal wasn't even in the repair kit!
A Massey-Ferguson pump (for a 175 or 178 IIRC), by the way, has a much thicker mounting boss where it attaches to the engine block and is therefore more resistant to warping and leaking. Also, if you can find an original fuel pump off a Series 2 engine, its valves are not peened into place but held in with a plate and brass screws - dead give-away is a cast-iron cam arm inside rather than the later laminated steel.
Dan.
69 2A 88" pet4 (still in disguise), 68 2B FC pet6 (still resting quietly), 74 S3 109" pet4, plus 19 other parts/project cars (2xS2s, 7xS2As, 10xS3s).


 
						
					 
					
					 
				
				
				
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