Shimano only made thumb shifters for 6 and 7 speed. I used Suntour XC Pro thumb shifters with the "ghost click" on my 8 speed drivetrains for many years. I think there was also a work around with some after-market clamps and barcon shifters. If you don't mind going to under the bar STI shifters, you'd have better luck. You'll be looking for the M737 stuff.
Suntour XC pro shifters with 8 speed Shimano cass. is golden.
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