Roger that... It's got to be a minimum of 3/8" OD for it to work (from my experience) it's darn near perfect to be honest. maybe take a look online and order them in... The easier you can make that job on yourself, the better off you'll be... Less things to perhaps mess up.

https://www.lowes.com/pd/Hillman-3-8...Washer/3012478

Here's what I used for the front pillar, and used the 1" long for the rear.

There's got to be someone who carries something like that....?