Question about post height for replacement tuning pegs

[VikingGuitar]

Hi all. I'm looking to replace the tuning pegs on a few guitars of mine. All three guitars seven strings; an Ibanez RGA7, an Ibanez SIR27FD, and an LTD V307. I'm looking at Hipshot and Gotoh locking tuners, but they offer multiple post heights, and I'm having trouble finding spec sheets for the guitars in question so I can get the right post heights. Does anyone have any insight into this or can point me in the right direction? Thanks in advance.

 

[MaxOfMetal]

Measure your tuners, buy similar.

Gotoh also makes ones with adjustable post.

Not that the difference between most available on the market, minus staggered ones, are extremely different.