There was a thread here years ago discussing fitment of inertia reel belts in the front of roundnose Minis.
Early cars had weaker mounting points in the B pillar. They were strengthened in the mid-late 60s.
Use of inertia reel belts can `almost' double the load on this top mount in an accident compared to a static belt.
Having said this, I've had 2 in mine (1970) now for years, no problem.
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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
