Holman Partition - Dog Door - Transit & NV Low Roof, GM, Metris Model 40645Holman Partition Dog Door Transit & NV Low Roof, GM, Metris Model 40645 This dog door partition provides security for the cargo area while allowing longer items to be stored in the cargo area. Requires wing kit (see wing kit options). Features: New dog door partitions allow for longer items to be stored in the cargo area by adding a magnetically secured flap in the partition. Dog door is 13. 5 W x 10 H. 18 gauge steel, to provide strength, security