smaller push on cap fasteners?

[engineerintraining]

i really want to use these type caps in my design application. The only problem is they are too large (.65 dia). i need around .375 dia. any chance of finding smaller versions. or maybe another type with the same ease of assembly?

here are the too large ones. they are called plastic push on cap fasteners:

http://www.catalognavigator.com/bol...atid_170__companyid_11286__lineid_1146__.html