I love this light weight compact option for mounting the motors. They work great.

I used these in conjunction with the Silver Spark motors. All I can say is they work and they are very light. I was going to make my own mounts but these work perfectly and are inexpensive. They are plenty sturdy and offer multiple mounting positions to the baseplate. Be sure to loctite the threads when attaching your Spark motors to these mounts and you should be all good to go!