The high-definition parts created by J. C. Tchang include these underside details; you can download them here:
https://jc-tchang.philohome.com/manuel/part_hd.htm
(Direct link to ZIP file: https://jc-tchang.philohome.com/manuel/I...rts_hd.zip)
Look for part 3958h.dat.
https://jc-tchang.philohome.com/manuel/part_hd.htm
(Direct link to ZIP file: https://jc-tchang.philohome.com/manuel/I...rts_hd.zip)
Look for part 3958h.dat.