3 - Kral Auto Exhaust Manifold repair kits. I had them on my GMC 6.0L - Fits many other GM engines https://kralautoparts.com/parts
These worked great- Way cheaper/easier than repairing broken exhaust studs. I had to get my head gasket done and had the broken studs replaced. No longer need these.
KAP 108 Drivers front/Passenger rear $30 each
KAP 169 Drivers rear /Passenger front $20