Just to pass on my experience with getting a spare. Most spare tire sites appear to want about $300 for their services.
1. Mopar spare part# 04782465AB. T145/80D18 spare obtained from OfferUp website for $50. 5X115, M14-1.50, 1.25" spacer (2) from Lugnut Guys for $45. Harbor Freight scissor jack $20. Hold down stuff (bolt/retainer) about $20.