The front part of the dust boot number is the same 20487239/40/41/42/43/44/45/46/47/48/51, followed by size differentiation;
The corresponding piston outer diameters are 27/28/30/32/34/36/38/40/41/44/46![](https://i0.wp.com/ae04.alicdn.com/kf/S58624ccdaf1f4b5db25a0c059765aa87D.jpg?w=1200&ssl=1)
![](https://i0.wp.com/ae04.alicdn.com/kf/S64b910bbd0a642bb92eefe19a80fa9a3z.jpg?w=1200&ssl=1)
The link to the oil seal is this:https://www.aliexpress.com/item/1005005712702273.html
The corresponding piston outer diameters are 27/28/30/32/34/36/38/40/41/44/46
![](https://i0.wp.com/ae04.alicdn.com/kf/S58624ccdaf1f4b5db25a0c059765aa87D.jpg?w=1200&ssl=1)
![](https://i0.wp.com/ae04.alicdn.com/kf/S64b910bbd0a642bb92eefe19a80fa9a3z.jpg?w=1200&ssl=1)
![](https://i0.wp.com/ae04.alicdn.com/kf/Sfee1a702d7e24f12975588ea35fbd183z.jpg?w=1200&ssl=1)