Cool! Aren't the clutch heads on our trucks slightly different? According to the ad, you can easily use a flade blade screwdriver on them.
Maybe you could before they rusted for 50 years.
I guess I got lucky then,I could count the amount of seized/rusted bolts I got on my
whole truck on one hand.....

And contrary to what some folks might think,I
do only have 5 digits per limb!
I
did use the screwdriver technique a couple of times before I got my clutch head drivers though.