HYDRAULIC ROOF PUMP RESERVOIR

Hi
For the last 6 months I've been working my way through various jobs to sort 1991 Clipper after several years off road.
Just got the car through the MOT and now looking at more cosmetic things- in this case the hydraulic roof mechanism.
I have a fully operational hydraulic pump VW 155-871-791, but the problem is that it is leaking at the joint between the bottom plastic reservoir and the pump body. In fact it is clear that at some time in the past the original plastic reservoir, which should be attached to the pump body by 4 bolts, has been replaced by a cobbled up arrangement involving a plastic cap off something or other and a jubilee clip securing it to the pump body. The photos attached illustrate the problem.
To avoid the very high expense of replacing the pump completely, I would like to find a replacement plastic reservoir.
Can anyone out there help, please?

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F173927949693


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Thanks for the link, Backinblack, but different pump and different mountings. Ideally I want a plastic reservoir off an otherwise knackered MK1 pump, if someone has one among their unused spares.
cheers
den