In order to insure compatibility of new Ridg-U-Rak beams with an existing Ridg-U-Rak rack system, please note the following: *If you are installing new Ridg-U-Rak beams into existing Ridg-U-Rak please notify your dealer. As of Jan. 1st 2000, actual beam length of 96" long Ridg-U-Rak beam is 96" (even inch increments). Before Jan. 1st 2000, a 96" Ridg-U-Rak beam was 96-3/8" long.(Even inch increments + 3/8") Without proper notification, interchangeability of new Ridg-U-Rak into existing old Ridg-U-Rak can cause a compatibility problem. It is mandatory that end user copy this Ridg-U-Rak beams order entry detail sheet, measure and indicate in writing by filling in the blank boxes in the form below the beam length between uprights columns and centerlines of upright columns, initial and date sheet and fax back to (636) 728-0008. No order will be entered without a completed beam designation sheet. **Ridg-U-Tier tear drop style rack and Ridg-U-Rak Structural rack are designed with even inch centerlines.