deck reinforcement bolts wanted

i got somo outside deck reinforcement like alex's the other day but the bolts i use to put it on get bent [on the back and front] so i was sayin if any one has any that are strong for the back wheel and two for the front bit
i will pay u watever is resinerble
 
I've got 12cm long bolts. Do you think it is long enough? These bolts are strong. Stronger than Razor axles , 12.9 chromoly steel bolts.
 
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