Bug rear suspension

Hi Can any one help rebuilding the chassis of 700 ES  on the top of the rear suspension strut it locates on a stud  mounted and welded into the top right and left of the chassis in the parts list this shows a step in the stud this i find is actually a split sleeve . Now in the strut top it also shows a bush /sleeve which I would expect  is this actually correct  ? that puts one sleeve on top of another as on this chassis it looks as it could be done  with a bolt with the head cut off  it is 1/2 inch UNF thread then sleeved with the split sleeve . The chassis is being 80 % remade using stainless steel  the only existing parts i am using is the 2 front large tubes  hope some one can help .
                                                                        Thanks Smithy