Description 2-3/8" Short Spool for 7.5" and 8.5" Spacing. Has 6" diameter base. Fits 1211, 1233, 1433 Tandem Discs. Replaces Sunflower SN2816. This item is a suitable alternative for the following: 864-SMA2816, 2816, SH2816, SN2816B, SU2816