We do not sell parts separately. All our products have a 12 month warranty and if there is a problem with your purchase during the warranty period, we can send you a replacement part free of charge(Except for consumables). Please click the following link to contact us: https://www.vevor.com/pages/contact-us.
Hello Chad. We have 6 plates included in the package. You can refer to the link for the specific size of the plates to check if your seed is suitable.
https://we.tl/t-fZIMNhVuik