The BMW Factory E36 Towing Manual specifies only one way to secure an E36 car to a flatbed truck or trailer -- by using something called a T-Hook.
Four T-hooks are inserted into a special access holes built into the E36 chassis and tie-down straps or chains fastened to the T-Hooks are used to secure the chassis to the flatbed or trailer. This is the best method for securing your car because:
~ suspension movement is limited, saving wear and tear on suspension components and providing a more stable load,
~ it is the only method approved by BMW, and
~ it is the quickest, cleanest, and easiest method by far!
Unfortunately, the manual offers no suggestions where consumers can even find one of these T-Hooks. There is no BMW part number and BMW doesn't sell them.
But I've found a source and I'm selling them in kits for $45 which includes four (4) grade 7 T-Hooks (rated at 3900 pounds), two (2) split links*, and complete instructions. All you need to provide is your race car, a trailer, and four tie-down straps.
T-Hooks work on all E36 and E46 chassis cars including M cars and Z3 roadsters and coupes.
Send me an e-mail to order or if you have any other questions.
(*which may be needed depending on your strapping system)