https://www.amazon.com/Set-Chain-Collars-Loops-Weightlifting/dp/B00LLQ0P48/ref=pd_aw_di_ci_int_im_exp_ip_m_p_1?pd_rd_w=6WZbZ&pf_rd_p=51299e93-6ebb-4ff8-a518-79e374f75e17&pf_rd_r=ETP5C1A0CHKHRYDQ3WGP&pd_rd_r=10ec2850-1fe2-4420-b686-167882dc39f3&pd_rd_wg=JSzw2&pd_rd_i=B00LLQ0P48

If you want a cheap and easy way, you could just tie the carabiners on with karate belt loops.

If you want to get something a little more fancy, clean, and reliable, you could get a pair of chain collars and hook the carabiners to those. Something like:

https://www.amazon.com/Set-Chain-Collars-Loops-Weightlifting/dp/B00LLQ0P48/ref=cm\_cr\_arp\_d\_product\_top?ie=UTF8