Who needs a micrometer when you got Google?
So
http://napaonline.com/Catalog/CatalogItemDetail.aspx?R=MRCES150R_0350388830 is the ES150R
Large Diameter Taper (Dimension B) : .7"
Length (Dimension F) : 3.5"
Right or Left Hand Threads : RH
Rod End Thread (Dimension A) : .75" - 16
Rod End Thread (Dimension E) : .562" - 18
Small Diameter Taper (Dimension C) : .61"
Stud Thread Size (Dimension E) : .562" - 18
Taper Length (Dimension D) : .74"
Thread Type : Male
and
Stock tie rod is
http://napaonline.com/Catalog/CatalogItemDetail.aspx?R=MRCES2953_0258085687
Large Diameter Taper (Dimension B) : .71"
Length (Dimension F) : 2.95"
Right or Left Hand Threads : RH
Rod End Thread (Dimension A) : M14 - 1.5
Rod End Thread (Dimension E) : M14 x 1.5
Small Diameter Taper (Dimension C) : .63"
Stud Thread Size (Dimension E) : M14 x 1.5
Taper Length (Dimension D) : .68"
Thread Type : Female
So comparing original vs new
taper length .68" vs .74"
Large Diameter Taper: .71" vs .7"
small Diameter taper: .63 vs .61
I believe on the aftermarket kit they provide a washer which would probably make up the difference in length. Are the tapers similar enough?