U.S. equivalents?

[Fergus Kyle <VE3LVO@rac.ca>]

Cheers to American cousins:
        (Brit buddies can resume the pint.)
        I have here a small packet of TAPK33BS pop rivets (of an original
65) which are used mostly for rivetting the captive nuts to composite walls
(noted as anchors for the inspection panels abounding).
        I have not been able to duplicate this side - I have RCAF
equivalents by the score but none so small.
        Does anyone have the U.S. equivalent and source?
Much appreciated.
Ferg
A064