It's a later type of pump - have you changed the camshaft to a different drive configuration ? Is the pump definitely seated home ok in it's housing ? If so - you will just have to 'modify' the pump with a file and or the casing until they DO fit!! If it's just the lock tabs causing the problem - throw them away.
While on the subject - be sure to prime it with lots of oil and maybe some grease or vaseline to be sure it will pick up ok when you go to start the engine.
Sadly, having to attack a new pump with a file is a well known problem
Ray. MMOC#47368. Forum moderator.
Jan 06: The Minor SII Africa adventure: http://www.minor-detour.com
Oct 06: back from Dresden with my Trabant 601 Kombi
Jan 07: back from a month thru North Africa (via Timbuktu) in a S3 Landy
June 07 - back from Zwickau Trabi Treffen
Aug 07 & Aug 08 - back from the Lands End to Orkney in 71 pickup
Sept 2010 - finally gave up breaking down in a SII Landy...
where to break down next?
2013... managed to seize my 1275 just by driving it round the block