The Sunday replacement 990 mounts are designed to work with Sunday frames that feature removable brake mounts. See list below for compatibility.
8x1.25mm (Fits Most Sunday Frames)
Thread-in 8x1.25mm brake mounts for the Sunday Funday 2/2.1, Wave 3, Forecaster and Soundwave frames. Will also fit the Waltz V1/V2 and Tango frames.
10x1.25mm (Fits Sunday Broadcaster Frames)
Thread-in 10x1.25mm brake mounts for the Sunday Broadcaster frame. Will also work with Haro/Premium frames with removable brake mounts.