JOHN,
I WILL NEED HELP WITH THAT TASK... I'M NOT VERY COMPUTER FRIENDLY.. THE BOLT WAS ON THE PITTED SIDE SO I SOLD IT OFF, I HAVE SEVERAL OTHER GOOD EXAMPLES OF 3.67 SELMA BOLTS.. BUT I STILL DO HAVE A 3.67 SELMA SHELL WITH 15X15 RIFLING.. I WILL DO MY BEST TO POST THOSE PICS FOR YOU.. I CAN ALSO TRY TO TAKE A PIC OR TWO OF THAT READ BASE I HAVE.. JAIME