THESE WERE MANUFACTURED SOME YEARS AGO WHEN METTYS WERE BEING RESTORED TO REPLACE THE THIN UNITS FITTED ORIGINALY, THESE WERE MADE TO LAST FOR THE LIFE OF THE CAR WITH GREASE NIPPELS FOR SERVICING,THESE BOLT STRAIT ON, YOU ARE BUYING A PAIR. SORRY FOR POST THEY WEIGH 1 kg EACH   These are 10.5" inches long for the earlyer models, please check they will fitt your car, i do have smaller 9.5" for later cars if you need smaller ones let me know and will list them for you.