I realise this question was posed a while ago. Did this ever get resolved? I fitted a silentbloc type wishbone spindle last year. Not from Mike T though. Seemed quite straightforward once I scraped all the crud off and could see where the clamps and nuts were. Then setting the castor angle needed some care. I think fitting the silentbloc type is the same as the origin type except you don’t have to grease it.
If the question was about the lower suspension arm I have nothing to offer.
Chris
Chris