I ordered the wet bolt kit from Trailair. Cost---$46.00 + $12.00 shipping.
I have it installed.
Here is a pic of the where it goes. you get 14 grease able bolts and 14 nuts, 8 brass bushings. The bushings go on the spring ends ONLY.
Next pic is what they look like. I circled the hole in the side of the bolt with white finger nail polish so you can see it better.
Also before I put each bolt in, I marked the head with the polish so I knew where the grease hole was. You should position the holes at either 3 0'clock or 9 o'clock so the pressure from weight of trailer isn't resting on them and it will make greasing easier.