Service kit includes wiper, lower bushing, foam ring, c-clip R12, and 6 glide pins. YB2122 and YB2123 include lower tube, upper stanchion bushing and wiper. Note on lower tubes: diameter can be changed between 30.9 and 31.6mm but NOT 34.9mm. Length must stay the same as original. 3rd party web sales (eBay, Amazon, etc.) are strictly prohibited by the manufacturer. All internal parts are available through BTI’s Factory Service Center. Please contact customer service for any other parts that are needed