Pro-Link GENESIS 40 single main retract .Available in standard oleo diameter of 8mm and 1/2" .
Sizes, drawings and more info: Genesis40.pdf
Image show normal retraction model.
NOTE: These retracts need a special electronic controller LGC12S to operate. To be ordered separately :https://www.xicoy.com/catalog/product_info.php?products_id=265&osCsid=4792d26870953b4361e95372d0bc56a7
DO NOT CONNECT THE RETRACT DIRECTLY TO A BATTERY. MOTOR WILL BE DAMAGED. NOT COVERED BY WARRANTY!