Currently, Elkhart RV Parts does not carry a dedicated fastener kit specifically for the Greystone HFK2421A stovetop glass-to-hinge mounting hardware. While we offer some replacement parts for Furrion and Greystone ranges such as glass cover hinges and grates, compatible fasteners matching your description are not listed in our catalog. We recommend checking with Greystone directly or authorized service centers for the exact mounting fastener set. If you need related parts like hinges or grates for RV ranges, we have options available that you can review on our website.