I am independent shock absorber re-builder in Phoenix, Arizona. I service many Koni shocks, the older 82 series type. Many times the main shaft is warn to the point it has to be replaced. I can supply a sample or give you sizes I need. My question is, your 300 piece order is that one size or can sizes be mixed as far as lengths go. Same OD size for all and threaded on both ends, different thread sizes on each end of the piston rod. All will be 15.75mm OD.