Sometimes your speaker manufacturer will offer to send you replacements if they have them. Klipsch once mailed me a crossover and a set of binding posts at no expense.
The Cardas Jumpers "plates" you refrenced cannot be adjusted. I use Clear Day Cable custom 4 wire Silver Jumpers and Cardas Clear Jumpers when not biwiring. (I have a Cardas price catalog)
These will fit your speakers:
The Cardas 11.5 awg jumpers are $150.00
The Cardas 9.5 awg jumpers are $210.00
The Cardas Clear jumpers are $350.00
Audioquest has some very inexpensive jumpers for $25.00 - see linkhttps://www.crutchfield.com/p_703PSCBIWR/AudioQuest-PSC-BiWire-Jumpers.html?tp=61599&awkw=756439...
Audioquest also makes offers these- see link https://www.amazon.com/dp/B00W4AK2K2/ref=asc_df_B00W4AK2K25311029/?tag=hyprod-20&creative=395033...
If you decide to use the metal/brass "plates" for jumpers, I would suggest hooking your speaker wire to the high frequency posts and "jump down" to the low frequency posts. Your results may vary.
Good luck, I hope this helps.