My 8.75" power-locks are in stock. See below:

https://www.doctordiff.com/8-3-4-clutch-type-sure-grip-powr-lok.html

Unfortunately, I don't know when the Sure-Tracs will be back in stock as the mfg has been dragging their feet.

If anyone needs to contact me, please E-mail. Phone calls are hit-or-miss this time of year. BTW, don't abbreviate "doctor" in my E-mail address. That is another guy. My E-mail address is doctordiff@gmail.com