Hi L.,
I doubt this will help very much, but the parts you describe sound similar to a crib we were given, but luckily we had all the parts & an instruction book. It is an Evenflo Jenny Lind Single Dropside Crib that converts to a toddler bed. (www.evenflo.com). The instruction book is dated 10/2002, so the bed, though never used, is a model about 5 years old. The book applies to model nos: 012614, 012615, 012616, 012617, 014614, 014615, 014616, and 014617. The model no. on mine is on a sticker on the base of one of the endboards.
I think the pole part you describe is called a dropside rail/rod (2 total). The other parts that work w/ my system are the following: the lower "L" brackets (2 used under the mattress support), the small & large bumper springs (2 each, 4 total), the left & right latch (1 each), cross dowels (4 total), and a bunch of screws (some wood, some machine) and nuts. Depending on whether it has a wood mattress support or a steel support you may need a few more parts.
If you think this sounds like one of your model I could copy & mail my instruction to you. Let me know. I bet 3 boys will be lots of fun!
Good luck! J. (new mom of 8 week old baby girl)