You called m'sieur.....
Although similar in principle the design is very different. With the swept axle the one bush is retained in the centre beam section and the pin is retained in the axle casting. The The centre beam pivots of course on the pin. It has been debated whether the bush should be lubricated as the oil or grease would collect abrasive grit.
My preference would be for lubrication.
However the straight axle pin is retained in the centre beam and the bushes are pressed into the axle casting. A circlip is fitted to the rear of the pin in case it should work loose and find its way forward.
A straight axle overhaul is liklier to be more difficult if the axle pin is seized in the centre beam. No matter how much this has been greased it can still seize. If after removing the pin locking bolt/peg (up to UK serial no 434523) the pin is free to turn in the centre beam...the job will be easier.
You will need to remove the bonnet (hood) and radiator. This will give you a better view of the areas of wear. Ideally the stub axles should be removed as well. If there is only wear in the bushes they should be driven out with a suitable drift or MF tool 322 and handle 550. The same drift or MF 322 should be used to fit the new bushes. The bush faces must be 0.020" (0.508mm)below the web face where the beam makes contact.Six thicknesses of shim are available to bring the endfloat to as close to zero as you can. They are 888 361M1/362M1/366M1 for .25mm/.128mm/.51mm and 1863 312M1/313M1/314M1 for .91mm/1.04mm and 1.17mm respectively. Ensure that the bush grease galleries are clear.
If replacement parts (casting or beam) are required they should be available and not too expensive. Your message sounds like you might be in the UK. If so secondhand might be available from Ron Greet in Devon or a new beam £75 and casting £130 plus VAT are available from Agriline in Worcestershire. Bushes are £3 each and the pin £19.
Let us know how you get on.
DavidP, South Wales