I don't know what make you have buy my LA machine had a special spool holder that I had to purchase seperately (actually I made the dealer throw it in!) and have to mount on the side for those spools. LA and Midarm machines are not set up to take those spools, mostly because of the issue not enough thread is loaded on them that you would use to quilt something.
So unless your manufacturer makes an adaptor spool holder for your specific machine I would not recommend trying to use those spools. Save them for using on your domestic sewing machine for applique or FMQ smalls that aren't worth the effort of loading them on the rack.