Our cars originally came with Girling shocks,front and rear.What you have appear to be Koni,considered by some to be the best replacement.Some,if not all Konis' are rebuildable,but I'm not sure about this type.Best to contact Koni. I believe that this is doable,and have been wanting to try rebuilding these as well(the original Girlings),but all I have are the rears,and don't want to proceed until I get decent,rebuildable Girling fronts.Quickie photos are of partially disasembled rear Girlings,from my 61' Giulietta spider.Regards,Phil D