No, it's softer than the metal, so after a while it will compress and it's all likely to come loose. Not a problem if you check it periodically, but as it's under the car......
If you go for stainless, you will need reasonable tools though. Call the engineering company you found anyway, describe the part (in detail, so measure it first) and ask them for a price for one off and for 10 off.
Also ask for a lead time, if the price for one is good enough, put an add on
(reserve at cost or higher), when you sell one, order the part