If it is a 4 bolt steering box, DLS in Derbyshire, UK just this month delivered a seal kit to me for around $18 AUD in just over a week. In speaking to Sovereign in Adelaide, they told me that they remove the Pitman Arm, replace the seals etc. All done in situ. Not hard to do yourself.
Give it a try. I did mine on my 1985 Classic.
Cheers, Ron

