[Marshall V. Daut]

Take a long needle nose pliers and heat the last inch or so. Then bend the ends to a 90 degree angle. Push the bolts upwards from underneath, slide the jaws under the bolt heads and carefully lift them up and down through the hole. Reverse the procedure to install the bolts. If you drop one inside the bellhousing while removing or installing them, don't worry about it. You can easily fish them out and start all over again.
My experience with those bolts is that they are longer with the rubber ball design than the original mounting pieces. If you switch to the original design, but keep the rubber ball bolts, you may run out of threads when tightening the large nuts.
Yes, long thin fingers are a plus in this case, should you need to fish an errant bolt out of the bellhousing!
Marshall