AM antenna masts and wiper blades

[Pacecar]

Seeing two different types of original AM antenna masts. One with a groove in the tip and another with no groove. Does anyone know if this is due to two different manufacturers or was there a manufacturing transition?  Also, there seem to be two different designs of Trico wiper blades that hold the rubber refills. One style is peaked. The other is flat. With both being marked Trico Made in USA. Was this due to a transition. With one style being an early style and the other later. Or was the flat style strictly a replacement ? thanks

[x66 714]

The original wiper blades on my 08/28/1969 car are not peaked. I've read somewhere that was earlier in 1969 with the peak....Joe 

[asm69]

I have 1969 Camaro z28 October 1968 Van Nuys build. The wiper blades are peaked and have the TRICO stampings.

[bertfam]

Anco and Trico blades were both used interchangeably in production throughout the year.

Re the antenna mast, both grooved and non-grooved have been observed as discussed in THIS THREAD.

Ed

[asm69]

I have 1969 Camaro z28 October 1968 Van Nuys build. My antenna mast is oval and has one groove on top.