How does the style differ from that listed in Elsevier’s guide here? Exactly which publication are you trying to match? I suspect that lots of the styles that endnote has for specific Elsevier journals will match. Unfortunately they are named for specifics rather than grouped by specifics. Endnote has never had a way to “search” for the appropriate matching style. Most author, year Harvard styles include the title, but punctuation can differ between them.
Having said all of that – many years ago, an endnote guru created this compendium Style templates collection - #31 by leanne and we gave examples of a more uniform subset. And the one below which can be downloaded from the above Style templates collection - #23 by myoshigi
SGGS1_Yr_Ti_Jo_Vol_Page -Systematic Biol.ens
Billoski, T. V. 1992. Introduction to Paleontology, 6th edition. Institutional Press, New York.
Morehouse, S. I., and R. S. Tung. 1993. Statistical evidence for early extinction of reptiles due to the K/T event. Journal of Paleontology 17:198-209.
Schwartz, M. T., and T. V. Billoski. 1990. Greenhouse hypothesis: effect on dinosaur extinction. Pages 175-189 in Extinction (B. T. Jones, and N. V. Lovecraft, eds.). Barnes and Ellis, New York.
If there are differences - this style can be edited to accomodate the minor differences.