New Reproduction 1976 GMC Motorhome & TransMode Maintenance Manual Supplement. This high quality Factory Authorized Reprint Service Manual covers the RV Models ZEO6581, ZEO6582, ZEO6083, ZEO6583. This X-7625 Manual has updated information and was meant to be used along with the X-7525 Manual [NOT INCLUDED] for full coverage. These Manuals were used by the Dealers to service and repair your GMC RV. Very informative and useful tool for the RV Owner. Original copies are virtually impossible to find.