I made one out junk I had laying in the garage 30 years ago. 2 pieces of 3/8 rod, 1 piece of 1/4" rod, 2-5/8 bolts, and a welder. You weld bolts 90 degees to the end of the rod, bolt to bell of trans, bend a 90 about 6" down, another 90 about 14" back, then cross your 2 rod and weld to catch the rear. Weld a piece of 1/4 or 3/8 rod across the lower rear of the rods so it does not spead and its done. Do not weld rod across front, that way rods bend and it works for big and small blocks. Ghetto I know, but never saw a need to upgrade.