That would be a K301A. There are still two different styles of dipstick tubes.
One tube is driven or pressed into the block at the front right corner.
The other style is a tube with a flange that bolts onto the front right side.
On both styles, the tube is not supposed to come off the base. On the style that is driven into the block, it is just that.... a press fit. Take a hammer and a block of wood or a rubber mallet and drive it back down. If it doesn't stay, the tube is likely worn out and you will have to either use some loctite or similar bonding agent to hold it in. FWIW, even when they are good, I put some sealant on the tube. On the other style, I believe that the tube is "soldered" to the base. It can be put back on in the same way. If you don't have a way to reattach it, you could use JB weld... but that would be a last resort. Neither have an o-ring on them that I can recall.
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