Whilst fasteners can be supplied from many sources, buying only genuine factory specified parts will give the kind of confidence that makes fitting none factory parts hardly worth the anxiety suffered - when the part either fails prematurely or does not even fit correctly to start with!
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Any machine is only as good as the quality and precision of its fasteners. Did you need to order gaskets and seals - CMS probably have most or all of what you require. Our pro-workshop gasket sealant: 08C70K0234M to complete the job like a professional.