I thought it might be prudent to supplement the BMW Mobility Kit in my X3M with a plug kit. Along with a multitool or at least a pair of pliers to remove a nail or other penetrating object, a plug provides an alternative to using the sealant included with the Kit and might save those of us without spare tires or RFTs from a tow.
After doing a lot of research, I went with the Nealey Mini Tire Repair Kit. It's simple, inexpensive, takes up little space, and makes what is described as a permanent repair, plugging the tire from the inside out. It's made and sold in the U.S.A. by a small business. Additionally, Matt Nealey, the company owner, was very responsive when I had a question, returning my call promptly and politely. He clearly wants his customers to be happy with his product and service.
https://www.nealeytirerepairkit.com/
Highly recommended.