Are they "pre-stressed" individual slats?

3.5 or 5" wide?    How long?

Its been quite a while (10+ yrs?) since we bought any new individuals and the 3.5" ones were no longer available back then already.

Do you have broken ones or just looking to replace the rough ones?

Ours were all getting bad and we ended up replacing them all with gang slats.   Used a boom on a loader and set them in through the side of the building.  Link goes to thread with pictures of putting new slats in.

http://talk.newagtalk.com/forums/thread-view.asp?tid=119231&mid=843111#M843111