You can use an octal socket as the spacing is right or take it apart and use the pins to make your own in plexiglass or lexan. Crystals from A1 or another can supply but they will often be little ones put inside the bigger case and may not like the current a tube osc can flow. Any crystal of the right type that is lower freq but close can be hand ground to the freq. In fact all the rocks in my DX60B I ground to the freqs I needed. Despite what one might think it is not that hard to do. Are you building the old 2 tube design from the old handbooks built on two slats of wood? 6ag7 and a 6v6?
A VFO of course would eliminate the need for crystals.
A Hartley osc is quick easy and ALWAYS works! In fact I have a two tuber I built with one. Glowbug QRP is a ball! I have mmmmm, lemme see, 6 I built here if I didn't forget one.
Be careful, it is addictive.
don
