Long time lurker since I bought my 22 ST in September.
My engine and transmission oil pan are unprotected, some parts are missing ( maybe different car specs for different countries), a member mentioned website selling Setina skid plates so I took a gamble and bought one.It finally arrived.
I looked underneath my car, I found out:
The transmission crossmember holes don’t have threads, my crossmember part number is L1M3-5060-A. Dealership parts department says it’s the right part for my car.
I tapped the crossmember with a size M10 ( oem bolt size showing in the system), found the crossmember to be made of aluminum.
Setina provides 2xM12 bolts, now I’m thinking, should I go 2 sizes bigger to fit the Setina provided bolts or should I stay with a size M10.
I’m worried about the crossmember holes ability to hold the heavy skid plate and their integrity if I hit something.
I’m thinking of using thread inserts (Heli-coil) to reinforce the holes but I don’t know if the whole area will crack with time.
I hope my findings help you guys and I’ll be sure to update if something new comes up.