The attached part number key can be used to understand the plugs for the 13b, but will not work for the Renesis plugs unless I am not able to read it (a good possibility!)  Looks like the plug thread reach is generally ¾ inch.  If the electrode stuck out much beyond that, there could maybe be a problem.

 

13b plug leading= BUR7EQ

13b plug trailing = BUR9EQ

 

 

Renesis lead plug = RE7C-L

Renesis trailing plug = RE9B-T

Special lead plug to combat hot start problems = RE6C-L  (for use in the leading position only!)

 

Bill B