I have a Dell 8400 bought in about 2004 with Nichicon capacitors HN(M).
There are 6 of these that show bulges and one with a light brown substance
appearing on top. I would like to try and replace these however they do not
match up to any of the instock Rubycon or Samxon capacitors.

Mine are as follows:

2200uf 6.3V Height 16 mm Diameter 10mm
1000uf 10V Height 14 mm Diameter 10mm

I measured these from the motherboard to the top of the cases. Is this
the proper way to determine height?

Is the height...