@paul0075 - Before you order a booster, check to see if you need the 60mm or 80mm spacing for mounting the master cylinder. There are two types -
1212406 master cylinder has 80mm spacing between the 2 bolt holes
673766 master cylinder has 60mm spacing between the 2 bolt holes
Brake booster p/n 1387640 from Skandix has 80mm spaced studs.
Brake booster p/n 1206727 is the 60mm one and Skandix shows it as discontinued.