I'd looked at those pages earlier but didn't see anything (aside from the E3TZ part number) related to these.
Going off the years though, I would expect to see more flat. My 84, 85, and 86 for sure have the round style.
I never knew there was a flat style until I ordered a set from lmc and thought they sent me the wrong part. The next time I went to the jy I looked at quite a few bullnoses and they all had the round style.
I know it's not really a big deal, I was just surprised to see that the flat style came out in 83.
Also, just to be sure - I am not talking about the support straps. It just dawned on me those could be considered flat (bar) vs round (cable) also.
Scott
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Camano' 1986 F250 Supercab XLT Lariat 460/C6
'Chanute' 1980 F350 C&C 400/NP 435 - Gin Pole
But there ain't nothin' wrong with the radio