What size (length) magnet for a Trembucker

[51501984]

Thanks to the search function I found a place to buy magnets. There is two lengths listed for A2,3,4,5 magnets. They have them 2.125 and 2.250 length ,which size do I want for a Trembucker?

 

[Zerberus]

Re: What size (length) magnet for a Trembucker

2.250