Dennis never made the TCB's when Elvis was alive though he does say he made Elvis a larger TCB that is being used on the tail of the Lisa Marie. No one seems to recall that though. (h) Dennis is a great salesman and he did make his mark in Elvis world with the glasses.
Elvis got them from S&A originally in LA then later from Lowell Hayes in Memphis. I own both a S&A from 1971 and a Lowell Hayes one from 1976, each is different.
S&A - thinner and pointer Lightening Bolt
Hayes - rounder & thicker lightening bolt
Roberts - more like a S&A but uses a small mm chain than the original ones.