The only chuckle you may have produced here is from the fact that you actually have some Spiratone gear. I got a few of their zooms plus a few converters when I picked up my two K2 film cameras about a year ago. I got them along with two Pentax 50's (M50/1.4 and K50/1.2) that are actually worth something.
You may indeed be missing the adapter for the TC. I'll have to check whether the TCs I got were actually Spiratone or another brand, but as I recall the Spiratone zooms had to have adapters to fit K-mount.
In any case, they're probably worth almost nothing today, as are my Spiratone zoom lenses. I packed them away because I was too embarrassed to try to sell them to someone - if you can't even fetch $30 on eBay, then what good are they?