I can say with absolute 100% certainty that CAT is still actively using the ASV undercarriage due to the fact that I still see truck loads of undercarriages heading down I94 on their way to the CAT factory in NC.
Are you sure they are for skid steers? are they badged ASV? no new skid steers have any ASV markings.... IF they are ASV good on them the new product is decent, now if only you could grease the bogies and idlers we'd all be laughing.