The 1500 Series Tremolo is the upgraded version of the 1000 Series Tremolo with stainless steel screws and a Push-In tremolo arm. The bridge plate, saddles, insert blocks, studs & inserts, and locking nut retain those of the 1000 Series. Like the 1000 Series, the 1500 Series is only available to guitar manufacturers and is not available for aftermarket purchase.
You can upgrade your existing 1000 Series with these parts to make a 1500 Series:
The 1500 Series Original can be found in both 6 & 7 string versions.