Catalog Number Cross Reference In an effort to meet Y2K challenges, we enhanced our enterprise resource planning systems, including a minor change to our catalog order numbers. Product codes, which were previously two letters, have been increased to three letters so they may be easily cross referenced. For example, what was a 45F-RC-02A roll clamp is now a 45F-RCF-02A — the F indicating that it is a fixed short arm model. For a cross-reference table of old and new catalog order numbers, click on the pdf below.