The one I use is similar to Ronnie's, and it didn't list the size either. The part description just said "screw". I Googled the part number to get the size.

I looked at the parts catalog specific to the OP's bike on HD's SIP, and the description was the same (screw), and the part number was not listed in the hardware list.

 

Is this PDF for sportsters?
I looked and the OP's bolt isn't in the list.

 

I think that list covers all years/models. The OP's bolt may be unique in some way (shoulder length?), and may not be a common hardware item. Part #3536 on that list is used on several different models and years, including current. Coincidentally, it is the same size bolt the OP needs.

 

That's certainly strange. I never noticed on the Ronnie's parts site or any of the other similar parts sites that use the HLSM engine allowing one to click on a part in the diagram.
Throw us a bone and let us know the secret site.
Could it be a site based on the ARI PartStream?

 

I just got this one from a guy over in General Chat and it will tell you the bolt size if you hover over the number
https://shop.suburbanharley.com/oem-parts

 

I also found a 'parts change' pdf file I had, that was supposedly for many of the parts number changes of my bike, but it didn't even have that part number either.

It's okay though, I think Rockout Rocker Products and barneynoy are probably right. I'll get me one of those in stainless and try it out right there at the Fastenall store. They're pretty cool about that with me as I've been getting stainless nuts and bolts from them for a few years now to replace many of the nuts and bolts on the bike (not anything though that needs SAE 2 or higher of course). I found a bolt that seemed to have the correct thread but not sure about the length being correct. It looks like it will at least hold the block in place so the axle doesn't move around so that I can ride to the store and get the correct bolts.

The real bummer about the loss of the bolt, isn't really so much the bolt, but I'd literally just put these on when I'd made the adjustment the week before and now the one is lost and man, are they really *nice*. The originals were bowing in too much as I think the original owner had no clue what he was doing, so they weren't worth a darn anymore. These are high-dollar, but worth it if you worry about the originals being so flimsy. These also look damned good too, so I splurged out the *** like a fool, heh. http://www.bungking.com/chain-belt-tensioner-plates/

I appreciate all the help everyone. Y'all have a really fantastic Christmas and don't nobody make Santa's reindeer skittish...I need to be able to try and put Rudolph in my freezer since my foodstamps are going from $32/mo to $28/mo (Don't get me started in what I think I'd need to do to actually get enough to help out!).

 

Correct on PartStream. I'm on my crappy phone now, and it's a PITA to attach a link on HDF's mobile version without entering each individual character of the URL. Here's a screenshot of the URL. I like the site because it's mobile friendly.