Extension unit (10) for an agricultural implement (1) and agricultural implement with such an attachment. The attachment unit comprises a base member having a mounting portion (21) for attaching the base member to the implement and a working member (30) having a working portion (31) for providing a predetermined work action to the implement and a quick coupling portion (33) for releasably coupling to a quick coupling counter portion (23) of the base element. The quick coupling portion and the quick coupling counter portion are arranged so that they are mitei each other at least mutually positive engagement with each other coupled to releasably connect the working element to the base member. The attachment unit according to the invention allows a quick and easy retooling of the attachment unit to achieve a desired work effect.
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