Hi Daniel,
As discussed and follow the Operator’s Manual in attached files for spreader bar assembly for helicopter lift,
• SPREADER BAR MOD 70 SPAN 3.0M (FRONT): use SL70 EA + SL70 IS 2M + SL70 EA = use 12 sets of M20 (bolts+nuts+washers)
• SPREADER BAR MOD 110 SPAN 4.0M (BACK): use SL110 EA + SL110 IS 2M + SL110 EA = use 12 sets of M20 (bolts+nuts+washers)
Total use 24 sets of M20 (bolts+nuts+washers)
I have 36 sets of M20 (bolts+nuts+washers) ready in our office. They can get from us when they need to spreader bar assembly.