Roffensian wrote:
There are three Breitling deployants and interchangeability will depend on what is currently on your GT.
The GT comes with a factory 22/20 strap or bracelet which means that you will have a 20mm clasp right now:
The deployant for the bracelet can only be used on bracelet
The deployant for leather can be used on calf or croc leather
The deployant for rubber can be used on Diver Pro II or Ocean Racer, but not Diver Pro.
Note also that the calf, croc and Diver Pro II straps have both deployant and tang variants so you would need to get the deployant version.
I've used the metal bracelet's clasp as a donor for a custom strap once. It was a PITA and a poor financial choice, so I would not do it over. Personally I am impartial to getting a custom strap made for the deployant normally used with silicone straps as it is so, so nice.
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For OP...The least expensive option (by far) is a standard tang buckle. It can be used on normal straps. It cannot be used on straps using a Breitling deployant. Additionally, this 'traditional' strap can be used on most aftermarket deployants, both single and double foldovers. Its advantages are cost and sometimes comfort. It's downside is it excelerates wear on the strap. Tougher materias like gator/croc and shark hold up to this usage far better than calf (which is much cheaper than croc or shark as well). Most of my sharks use PAM-style Pre-V buckles. Anything calf or python or not so tough material is usually on a deployant.

A cheap 'standard' double butterfly deployant looks like this

My personal favorite aftermarket deployant is only 7 dollars shipped.
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This is the standard deployant used on Breitling straps specifically made for it

It is a friction lock, and a single fold-over. Some people love this, other's dont. For my smaller wrist, I find it to be uncomfortable.
In order to use the above, you need a strap that looks like this

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This is deployant/clasp used on silicone dive straps and is my personal favorite.

I personally like the look more, prefer the secure lock, the comfort more than anything else on the market made by anyone (again, just my opinion).
For this you can by a dive strap to go with it. If you have a custom strap made, it needs to follow the same lengths and holes as the silicone straps do once they are sized for you.
