I have worked at Lancer BOSS. Lancer BOSS was taken over by Jungheinrich in 1994 and the business for side loaders has been closed I think 1999. Spare parts should be available via Jungheinrich, best is Jungheinrich UK. Depends an little bit what make and modell it is. If it is not too old, there should be a good chance via JUNGHENRICH UK.
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