Actually sb3 must be in the correct position as the two sb4 were a good fit although I didn't weld them in as my diff is 7.5" and so will mount them later as recommended by Andy to save cutting the diff lugs.
Andy you did say the sb5/6 mitre angle can confuse but I'm sure I had it right, mitre angle to top and 52 deg to sb3.
May have just been a tight fit and need a quick clean off rough edges. I will probably have the same bother with all diagonal tubes ensuring they are in exact position.
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