For what application? The only one I know of is LWRC's https://www.lwrci.com/LWRCI-UCIW-Buffer_p_153.html AND https://www.lwrci.com/LWRCI-UCIW-Buf...ing_p_154.html AND https://www.lwrci.com/LWRCI-UCIW-Rec...ion_p_152.html As far as weight goes its easiest to just pop it open and swap them around yourself.