Can anyone tell me the length of the refill? I think it will fit in a different brand, as long as the length is right.

The screw-in refill is 4.75 inches including black applicator tip through ball-point at end...

The answer ("they are basically all the same") doesn't make sense for this particular refill because it is number 8100. Look at the packaging. I need Cross ballpoint 8513 as well. I cannot find it on Amazon. Looking elsewhere. Don't want some fake substitute.

ASIN	B00006IEC9
Best Sellers Rank	#9,864 in Office Products ( See Top 100 in Office Products ) #55 in Ink Pen Refills
Brand Name	Cross
Customer Reviews	4.6 out of 5 stars 2,618 Reviews
Global Trade Identification Number	00073228005041
Ink Color	Blue
Item Dimensions	6.5 x 2.2 x 0.28 inches
Item Height	7 millimeters
Item Type Name	Fine
Item Weight	0.3 Ounces
Manufacturer	Cross
Number of Pieces	2
Point Type	Fine
Style	Fine Ballpoint
UPC	073228005041
Unit Count	6.0 Count
Warranty Description	Lifetime Mechanical Gaurantee

Cross® Refills for Cross® Ballpoint Pens

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