Use this weld in receiver to create your own control arm or chassis mount with an SPC xAxis sealed flex joint. This weld - in end ring is designed with optimal press fit for the xAxis and includes two snap rings for retention and an access window for easy snap ring removal. For xAxis with a 40mm OD. Refer to www.specprod.combuilderseries for sealed flex joints that will work with this end ring and suggested press adaptor. California Residents WARNING