Hi, just put spacers in, one each side & center rosejoint, eventually put a washer in to fill the gap. Lots of photos on SGT web page. Good idea to download those photos.
View attachment 117460
View attachment 117461
Perhaps something like this.
look up Paulbav (Paul Baverstock) or Dan Winkworth SGT buildlogs on this forum. Lots of great info there. Same for Keith Baker SGT build
Hope this helps you

Morten