Ok.
Took some pictures. This is an old bike I have from when Ford had a promo where you could option a mountain bike with a ford ranger.
The rear hub locked up and the cassette won't rotate. I bought a new wheel (years and years ago). Not sure if it was ever installed.
The 7 speed cassette fits on the new wheel, but there's space (doesn't tighten when the lockring is installed). Do I need to buy a spacer, or do I need to order another wheel?
I'm also missing a rear skewer. Are they all the same? If not how do I order--just measure the length?
The mavic X138 is the original wheel, the other one is the new one I bought years ago.