Take one wrench, not two to your next fluid service. The Schwaben Service Wrench fits both crankcase and drain plugs in many VW cars. Use it to remove the drain and fill plugs in your MKIV manual transmission. Then use its 17mm box end to install your new ECS Tuning magnetic drain plugs.
The 17mm hex head also fits many other VW manual gear box drain and fill plugs, dating all the way back to Type I Beetles.