I was hoping to find the part #'s for the No. 13 and No. 15 wiring harness clamps, but have not yet been able to.
Following the Waytekwire suggestion, the releasable clamps at the bottom of the webpage linked below appear to be functionally identical to the OEM part. Note the number on your Toyota clamp is the diameter in mm. So the No. 13 clamp holds a 1/2" wiring loom and you would choose your Waytek clamp accordingly.
Releasable Cable Clamps | Waytek Wire
Following the Waytekwire suggestion, the releasable clamps at the bottom of the webpage linked below appear to be functionally identical to the OEM part. Note the number on your Toyota clamp is the diameter in mm. So the No. 13 clamp holds a 1/2" wiring loom and you would choose your Waytek clamp accordingly.
Releasable Cable Clamps | Waytek Wire