Ahh...yet more proof of Mir's theory of relativity :
"A screw dropped in the shop always bounces the other direction".
But wait! you might protest - what is the direction? to claim the other?
That's why it's a universal principle of...
The front and rears are both one piece, bonded into a slightly cone shaped flanged steel shell, with a tube steel core, that the bolt goes through.
Front and rear are different length.
And the left and right rear CAN use the same part, although...