From left to right they weigh 82 grams, 65gm.,70gm., and 70gm.
Were these factory or accessory?
I have some brass ones that say Ford on them.
I think they are from 1912 - 1917.
Every one of the ones in the picture below in the group on the right has Ford Script. The top left one is an original roller from the "two piece" 1909 - 11 timer.
The bottom left is a reproduction for a "two piece" timer. For whatever reason it is a mirror image of an original.
Note that some are slotted for a long pin that went entirely through the camshaft. Later ones used the pin that only went halfway through the camshaft, eliminating the possibility of misassembly.
Isn't the brass one lower left in your picture correct for 1909-11? The darker one above it missing the roller is opposite rotation because it is Model NRS and goes on the back of the camshaft by the firewall.