you're incorrect yet again mate... the stock solid lifter setup in any mazda engine that has it is shim OVER bucket... as shown in the pics on the previous page, you will see that you have a metal disc over the tappet... Nissan and Toyota also uses this style of lifter
the pics of those lifters are the top side view, so if you have a strong torch, you can see if you have HLAs or not
shim under bucket is more common in racing applications where valvetrain mass is important... shim under buckets are lighter but are difficult to adjust... shim under buckets is a small cap that fits over the valve stem and the tappet goes on top of that shim... mazdaspeed in one time made shim under bucket lifters for the BP
the cheapest cam upgrade for the BP in the series 3 BA are the 98-00 MX-5 cams... much more aggressive timings and since the base circles are the same, there should be little to no adjustments involved
