I couldn't resist following up...http://embed.widencdn.net/pdf/plus/ssttoolbox/43dwzmt6ms/C-C-2019-p046-047.pdf The BP-3 is wildly expensive, $5 instead of $0.88 for the 2"! It looks like you'll have to special order with the 1" hole. https://www.lowes.com/search?searchTerm=Strong+tie+bp-1+washer WL