This shock absorber is used as front double shock absorber . We are the supplier to the OEM of e-motorcycle in China. THe install length is 290we can also customise this products at your request. ISO9000:2000 & TS16949 certification, more than 20 models,mainly export to European, South America , East AsiaGas filled/oil filled, and enstrengthed shock absorber tube,makes the suspension lower, cool, ...