Can't find any info on 4532458 (458r on the bar), and 4532459 (459l on the bar).

These are 1.00-in diameter, 41-in long, there might be a P on the part number.

I found a photo of 4532456 and 457, these are supposedly .980-in diameter.

The only other 1.00-in T-bar for B/E is a P5249159, these are for both left and right.

I've had these 458/459 for about 20 years, did the part number change ?
They appear to have a lot of hex offset between front and rear hex, I was hoping I
could find some info or maybe installation instructions.