I hit the LKQ Jackpot. I hadn't been searching for XK8 parts much beyond FB Marketplace and CL. I checked my local LKQ inventories and what do you know, a 98 XK8 placed on the lot two days prior. I grabbed a toolbox and headed out assuming the worst. When I got there, the headlights, bumper and top pump and latch were gone, but everything else was untouched, and it was the matching interior color code. It had an oil change sticker showing it was due 9/1 at 137k. I assume timing chain tensioners broke and it was scrapped, but it was the nicest car I've ever seen at a pick-your-own lot. The top was in excellent condition, the leather seats were almost completely without cracks and tears, etc. The hood was missing clearcoat, but the rest of the body was dent free and mostly shiny.
There was no trunk floor so I'll keep rocking the homemade one for a while longer. All told I spent $118 before taxes and environmental fee.
cowl piece under the wipers to replace the one cracked by the tree: $11
wiper regulator, all arms and motor: $15 - I was going to dig into this to be prepared to fix the unattached right wiper and figured I would learn on this car. Once the trim piece was removed, 4 bolts and a connector had the entire assemble out in about 5 minutes. No matter what I find I now have an entire replacement for $15. Oh, and the wiper arms were so nice I took those too in case they are worth swapping, $12
glove box to replace the broken latch, $15
armrest with fully intact leather to replace the current one with cracks right at the elbow, $7
A pillars to recover and swap in, and two door edge felts - I couldn't remember the condition of mine, and these were mint, $16 for all (4 @ $4)
I snagged the three gauge cluster to replace the broken nav unit, $27
the wood dash - it's real wood here. Unfortunately the passenger side airbag cover was very cracked. Every other piece was perfect. I got the center to match the gauge cutouts, the speedo bezel, and both AC vents. The set (including the airbag piece) sells on eBay, etc. for $300-500. LKQ price for the entire set - $9
cigarette lighter/12V port to replace the corroded one, $6
The only thing I didn't do was get down under the back to see if it too has a spare spark plug or what the line actually do. I still may go back planning to get under it still.