We now have in stock a brand new 10 tooth Starter motor for the 616-720 AC large frame GT's Also fits the 4040, 4041, & 9020 Simplicity GT models as well. We also have a rebuilt/exchange program on these Starter motors under B&B P/N- 1703-18. Either way, you can't go wrong with B&B Custom Circuits products!! Don't cuss! Call or email us!