Glow Plug Insulator Caps?

[TEV]

I have had no luck locating more of the insulators/caps that were on the glow plugs on my Lehman 4D61 which uses glow plugs - BERU#5962.3H or DENSO#DG-001. Anyone have any idea where to look?
One option is of course just not worry about them, but figured they were there to prevent any contact when they had power.
Thanks

[tkeithlu]

That's a common glowplug; Kubota uses them, I think.

That said, rather than search why not use short pieces of the right size hose to fit over the top?

[TEV]

Thanks for idea of using a piece of hose/tubing I thought of that as one option, though I did find that Toyota makes insulators for glow plugs on some of their diesel engines and they look like will work perfect and for $0.80ea I found some to pick up.