I was wondering if you could get aftermarket interior parts for our cars? also are there any lowering springs available on the market?
Yup...Also,depending on the year of your Mav/Comet you can get arm rest/bases,seat foam(buckets) brake and clutch peadal rubber pads window crank handels,door lock knobs and so on as long as it crosse over from mustangs to mavs/comets...The stuff is out there if you know where to look.
You'll find that with Mavericks & Comets, there is very little new aftermarket support. Auto Krafters has a catalog, which you can download off their website, also, some Mustang parts cross over (it's a bit of work to find out the parts, but just ask and we can help with direct parts) Used & NOS are your best bet. As for the lowering springs, any 1970 Mustang spring will work, but since they can be a heavier car, you might need to cut a coil or 2.