This set of Ti64 Titanium turnbuckles are made in the USA and is designed to fit the Yokomo MX4 Box Kit.  M3 tread.

This kit includes 8 turnbuckles (1x 26.5, 1x36.5, 2x42, 4x52).  
 
NOW AVAILABLE available with RPM Heavy duty ball cups!  https://www.dragonpunchrc.com/product-page/rpm-heavy-4-3-duty-rod-end-ball-cup-set-16-pack

Generic picture for reference only.