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This upgrade is for the 40mm non string thru Gotoh tremolo only.

Besides the standard 40mm we have made several upgrades such as the 34mm regular and string thru models like the 510 and many others..

All Gotoh block lines are upgradable. If the 40 isn't what you're looking for then please email us a picture(s) @ stonetoneguitars@gmail.com of the back cavity to see what style block you have whether string thru or non so we can further discuss the necessary details to quote you a price accordingly.