These are widely used in 70- 2000's+ GM vehicle in trim retaining, shaft ends, heater control slides racks etc. Not always needed but a PITA when you need them.
With is a wider variety pack of 10 of each size from small to the normally used larger OD
.jpg "Sill Plate Set: 55-57 Chev / Pont 4 door Pillarless")
.jpg "Grill Brace: 69 Camaro upper")