I need the sliders parts or support bars to hold the fences of the crib those parts that let goes the fences up and down

check out www.productsamerica.com

they have kits for replacements for many brands of cribs

First you will need all of the original hardware that came with the crib for it to be safe. Then you might want to google it to make sure there were not any recalls on it ever, just to be safe again.
Then I beleive you will need 2 flat screwdrivers and an adjustable wrench or plyers. You will need to connect all four sides and the bars that go under the sides that release the side to go down. Then the parts that hold the mattress and then the mattress.
ETRONIC

You can get any part for a crib on link below.

http://www.productsamerica.com/

Please rate 4 thumbs for free answer.

Childdesigns has gone out of business so it may be rather difficult in locating parts. You could try posting on various buy/sell sites,or try secondhand shops,yardsales,etc.

Most of the cribs that you buy have directions on the bottom of the mattress board on how to assemble. They might not be word for word, but its pretty informative. Hey, it does have pictures! LOL

I have a similar problem, but a different Simmons crib. I called the company that momof4girls unrecommended and they were VERY helpful, but they were not able to ship me the parts as Simmons discontinued this type of hardware in the early 90's. My crib has a headboard and footboard - the 2 side boards are able to slide up and down on aluminum slats (almost 3 feet long.) The aluminum slats are connected to the headboards with 8 bolts; what I needed to order replacements of are the plastic sliders that allow the sidewalls to go up and down on the aluminum bracket. Not only do they allow it to go up and down, but without them you are not able to assemble the sidewalls to the crib at all. I solved the issue buy purchasing L brackets at Lowes and permanently attaching the sidewalls to the headboard and footboard, but it made it so the sidewalls did not raise or lower. I am ok with that! However, if you do NOT have the aluminum slats, you may be out of luck. The spring for the bed attaches on the aluminum brackets, so even if you were able to bolt the 4 sides together, you still have to figure out a way to attach the spring for the mattress (which connects by sliding a hook into holes on the aluminum bracket... no room for bolts here.) I am rather surprised that the hardware for this crib is plastic and aluminum; the bed is HEAVY and it is very difficult to put together as the aluminum slider is easily bent and the plastic sliders are flimsy. I actually broke the plastic pieces during assembly. No wonder this hardware was discontinued! I called Simmons and asked if they had an "updating' kit... they do not. Good luck!

There is a company that sells replacement parts for this crib. You can go to http://www.productsamerica.com are call 1-800-772-1041 and they can help you.

If you can tip the crib upside down, it may be on the underside of a bar/piece of crib. Before you go any further in buying it, make sure it has not been part of a recall.
Check with the US Consumer Product Safety Commission with the name KINDERCRAFT and the model number you find. Make sure there is not something more that you should not be using it for.

Compare the other hardware that you already have to the replacement parts at www.productsamerica.com. They carry replacement parts to many brands of cribs. Hope this helps!

the crib locks of the side railings broke. where can i get new ones