Here  are   2 NOS  1 7/8″  muffler clamps .    P/N  3754882 ,  and 2 NOS  1 3/4″  P/N 3683812   $8 ea.      buy 1 or 2  or all  .   the 1 7/8″ clamps where used on the front of muffler on  216 motors , 59  dual exh. , 61 348  and 62-3 327 at resonator  exc. HP.        The  1 3/4 ”   ones  had many uses here are some ;   muffler to tail pipe  37-52  Exc. PGlide, 53-55 Corvette, 57  V-8 with dual exht.    and 57-61 Corvette .