me and dad still have to do some investigating with the drive shaft that snapped to see if they can be relatively easily changed (remove staked ones and machine a spot for the circlip) on an oem shaft ,
but the one i got out of my first svx had replaceable uni's in it already
the parts are ruj1786
or ruj1786r (stronger)
they are quite cheap to buy of ebay.com.au
im not sure what the part would be called over in the states or other countries (possibly the same) i cant find a cross reference chart with it on it
but im sure there would be one the same for other model cars