Thank you Peter!
This explain, it looks like (i have noticed as well for other matters) that the manual has not been updated in line with production specifications.
Yes, the rubber bushings are gone! i am in touch with Brian Eacott to get the full set. including for the differential housing. I will need to check the leaf springs brass bushings too.
it is a job i plan to tackle when i will take apart the leafsprings to be recambered and the shocks to be rebuilt.
Now i just need to move the car to get the technical inspection done to get it road registered. I dont want to move it before to lubricate all i can lubricate. I dont know when it was done before.