Have you tried asking the same question on the HMVF trailer forum or the FB British Trailer group? People were looking to reproduce these parts as they are so scarce. I think the same filters and pumps were fitted to both trailer and lorry mounted bowsers.
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Simon King (MVT1406)
Ford GPW 43097 / M1501912 / 40YH40
SS Cars 10cwt GS Trailer
Bedford MWR 47140 / 49RG30
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