The 72 124 Spider is on the road and we have been having lots of fun driving it. Now it is time to get rid of the 75 parts car. But before I do, I was wondering if there are certain parts I should hang onto that are likely to be needed, and not readily available? I don't want to hang onto anything big (engine, transmission, etc), and if I can buy it from IAP for a reasonable cost, then it probably isn't worth keeping just in case. But are there some smaller items I should keep?

There have been many things people ask for on here.
When I parted out the 80 I had I keeped everything I could
Sunvisors, ashtrays, gauges, shifter noob rims, seats, steering colum,door handles
Window handles,glovebox with door
And the intake with Carb will sell along with the dizzy
All and all save what you want or what wont last the 20 yrs you'll have it

Keep any trim parts that are in good shape, like interior parts or sidemarker surrounds, taillights.

Ignition switch and gauges if they are good.

electrical harness with all the fiat specific plug-ins. there is a lot a unique rubber and bolts that are very hard to come by.

Keep the 1800 head and intake. Great upgrade if you ever go to a 2L engine.