Do you mean something like this:

https://www.amazon.com/Anderson-Metals-Brass-Fitting-Connector/dp/B000BQPZU8/ref=sr_1_9?gclid=CjwKCAjwxOvsBRAjEiwAuY7L8u76KtwCxXL68buI2hfGuKiK5Fasu_v5pENjYKkU-56Pg1Ap2uY_JxoCHdMQAvD_BwE&hvadid=198209184878&hvdev=c&hvlocphy=9031928&hvnetw=g&hvpos=1t1&hvqmt=e&hvrand=15520746179461690934&hvtargid=aud-646675773986%3Akwd-322327500389&hydadcr=954_9642224&keywords=5%2F8+barbed+fitting&qid=1570460132&sr=8-9

Or maybe 5/8 barbs on each side.

It's not cheap so much as reality being difficult at the moment. Taking off the cover might keep me up til 2 am one night when I can't afford to do so. I've not seen the new part, perhaps I should order one and that will give me a better idea about options.

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1986 300SDL, 362K
1984 300D, 138K