Parts are available from ford still 2 bushes in the lower column but i would replace the roller bearing & bush in the top also as it all has to come apart .....

Basically if i remember correctly - remove steering wheel - cowling - wiper & indicator stalks - then you will see 2 13mm nuts as yr lookin down into the dash - remove these & the 2 under the dash by the peddles - you should then be able to remove the ignition housing complete - the 2 lower bushes are situated at the bottom off the steering shaft that is now visible due to removing the ignition housing - the roller bearing on the top is situated in the ignition housing itself - there is a white bush u will see also when steering wheel is removed - just remember to take a photo as your doing it as it really does help especially if u 4 get where the spring goes !!!

Hope this helps.........