The seller I bought a recommended (on another jeep site) block-off plate on eBay no longer is listed/registered there, but I found their FB page. Also found another potential vendor, midwestjeepwillys.com
As far as block-off plugs, I found a recommended one either on here or another site, Dorman 090-061 "oil drain plug" is a direct fit, so I bought 2 of those. Suffice it to say I have not deleted my EGR yet so I cannot confirm fitment on any of these.
Don't know if this helps but thought I'd share.
https://www.facebook.com/profile.php?id=100063534429634
https://midwestjeepwillys.com/3221283p.html