Saving Old Seagulls

While going through a couple of old boxs of Seagul parts I found these two that fit the witworth nuts and bolt heads of my Seagulls...



...they probably would work in an emergency...but for regular spanner spinning they are a bit awkward to use. Other than a spring and new cotter pin and a good used clean spark plug...it might be a good start to an emrg kit...what have folks found to make up a useful kit?

John used to sell a kit. Not sure if he still has them.