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Hi guys...The struts I am installing are a bit more heavy duty than the ones I removed which supported 1 3/8 inch shafts...They have a square hole type of configuration...I wanted to drill them out and install...What size diameter bolts would you recommend?? Thanks, John

I never used anything larger than 3/8 and never had an issue.

Thanks Bruce...I guess I will use 1 3/8 Carriage Bolts