I purchased ready made harness for as little as $29.
https://www.ebay.com/itm/23434853401...EAAOSwCWlhxDzw
Maybe you can use the parts or as is?
Just be forewarned the set I purchased was pinned incorrectly as delivered. Blew my fuse as all coils were grounded at once. Sure seems the plug parts are expensive when you are repairing/replacing them.
Have you checked out these guys? Seem to have most everthing.
https://www.customconnectorkits.com/56-products/