drivers side on mine so passenger for yours under the front wheelarch on the chassis leg itself between the four bolts that hold the power steering box on.
hmmm , well its either been ground off when somone else was looking for it- to get all the **** off I mean and that means its had a replacement chassis which is good so be happy!
or its a ringer - thats bad!
after 40 years ont he road you have to expenct most bits will have been changed- old leyland cars wouldnt still be about otherwise