Telect does not sell a lug for using #8 AWG wire on the 009-8005-3400 panel's output studs. However, both Panduit and Burndy offer a lug that fits the 0.375" maximum width requirement. The part numbers are the following:
Panduit part number
P8-10RNHT6-Q & PV8-8RN-TBurndy part number YA8CLG4