The WD21 came with them. Took several years for me to find out what those 2 pieces of tubing were for. Don't know if the R50 had them too. I have never used mine that I can think of, I have a sparkplug socket with a universal joint built in. I use it, a short(I think 3") locking extension, a second u-joint and another extension to do the infamous #6 plug. Also use plenty of profanity while lying on top of the engine and radiator support with the hood latch and other sharp bits drilling into my gut while hitting my head on the hood.
Not bad to do #6 with my WD21, 3" bodylift makes a lot of things easier to get at, but with the R50, no easy way to do it unless you already have the intake plenum off for other work. That is a miserable job in itself there.