68 front bumper guards

[GIBSTER]

My 68 has large front bumper guards that clamp to the bumper, and at the bottom bolt to the sheet metal of the car, like in this pic on e-bay  # 330056115326 .  I have had other people say that they should be the smaller ones attaching only to the bumper, What is correct ?   
 

[gro51]

'68 used the large bumper guards both front and rear.

[lakeholme]

Part of the confusion might come from the original GM illustrations for 68 front bumper guards.  Under custom features the illustration for front guards looks shorter...