These brackets attach to the cylinder heads on GM TBI engines from 88-94 

These ones specifically were removed from a 4.3 V6 engine, but may fit 5.0 and 5.7  

The plastic spark plug wire retainer attached has broken plastic 

Shows some signs of dirt, dust, grease, etc. 

Two of the brackets come with screws the other does not come with any hardware 

The larger bracket attaches to the back of the cylinder head on the driver left hand side of the engine 

The others attach along the side of the cylinder heads