Per shop manual and as you noted you need to use the 59 to 62 front harmonic balancer bolt and washer to install the 63 & 64 harmonic balancers.
The bolt size is 9/16" - 18 and usually about 1 5/8" long...with a very thick large washer. You need the puller tool to get it off but just the large thick bolt and washer to put it back on. This bolt size is usually not one stocked in your typical hardware store but have new yellow zink plated Grade-8 9/16" - 18 steel bolts and front bumper bracket to frame bolts (same size) that I sell for $5. If interested shoot me an email to firstname.lastname@example.org