Fifty, I did not riveting anywhere. The bling on my headstall came that way. As for the conchos, the dots are silver on a background of rusted iron, and it attaches to the bridle by sliding on, (remember , there is a "loop" on the backside of the concho) Look at that website. Out West Saddlery.
This was my first western bridle. It is stiffer than an English bridle. I applied Lexol first, then a TINY amount of neatsfoot oil. Very little. Then I topdressed with saddle soap. Saddle soap is glycerin and I have been told that if you apply a thin layer of it just barely watered down enough to make it applyable. (I mean you put the tiniest amount of water on the paste) and rub it over the oiled leather it makes it less vulnerable to dirt/sweat.
When it comes time to clean, wipe first with warm water, then with water and a little saddle soap. Let it dry a bit and add the lexol and/or neatsfoot oil.
There are a ton of products and way of caring for leather and my way might not be the best. I am open to learning a better way if one wants to show me.