@nigelmann99450 The Tesa tape that iFixit offers is a generic adhesive tape you can use to cut to shape for the Apple Watch SE
If you want something specific, you'll have to do some digging, as you can find pre-sized adhesive for your watch. For instance, this site has 42 & 44 mm options for the SE: https://www.repairsuniverse.com/products/apple-watch-series-4-40mm-pre-cut-lcd-frame-adhesive