Need help with speaker wire connection to ARC Classic 60

I have no desire to modify the amp.  I ordered some Kimber Kable 8tc in bi-wire configuration with bananas on the speaker end and bare wire on the amp end so I can terminate once I found the right solution. 
One thought I had was to bend the wire in a hook and solder, but I’m not sure how good of an electrical connection that would provide.

Those fins will most likely just snap off if your not careful. That is called a barrier type terminal strip. Your lucky to have them, AR knows what they are doing. Your best connection is going to be with good quality ring lugs carefully crimped onto your speaker wires. Tighten the screws holding the ring lugs snuggly and never ever worry about your speaker connections at that end of the cable. If your lucky, your speakers support the same type of connectors as well.
Banana type connections are designed for temporary connections in test gear and how they wound up in stereo gear is a mystery to me. They suck! they fall out or can be easily pulled out, sometimes shorting the amplifiers outputs on SS gear costing major dollar repairs.
When using an amp with 5 way binding post I never use banana jacks, either bare tinned wire or a crimp on connector.
Did I say yet that banana plugs suck? Yes, they suck! Get rid of them.

BillWojo

This is what you need:

https://www.amazon.com/Hi-end-Adapter-Speaker-Connector-Wy-yp01/dp/B00X9FET7I/ref=pd_sbs_23_img_0/13...

Why would you put those on barrier strip connectors, just to use banana jacks? Did you ever look at a banana jack closely? They make several small point contacts inside of the hole, surrounded by open space so that things can slowly oxidize. They were never intended for long term connections, they are for quick and dirty test instrumentation connections and just the process of inserting and removing the banana jack helps clean off the oxidation each time it's set up. They were never intended for set it and forget it applications.
A ring lug on a screw type terminal forms a gas tight seal when tightened and is forever.
There are many 50 or 60 year old industrial controls with hundreds of wires secured by ring lugs and screws. In all my years as a tech, the only failure I have seen is if the screw was never tightened. If it's a high voltage/amperage circuit it fails almost immediately, on low voltage control circuitry it can take years before oxidation takes it's toll and the circuit fails.
I have never seen so much misinformation as in audio. Bling seems to outweigh good engineering all the time. Yet folks will pay thousands of dollars for a piece of gear (superbly engineered and built) and use junk connectors to hook it into their system. Really amazes me.
BillWojo

I had the same issue when I owned an ARC D70Mk2...which was a truly great amp. The solution for me was to have the speaker cable company add small spades at the amp end ( most can do this with no problem).
Do NOT snap off the fins or try and bend them...bad advice above!!