Rear Shock lengths

What are the factory length rear shock sizes for the Seca 550, Seca 650, and Seca 900?

I think the previous owner may have put shocks on my 900 that are too long. Whenever I put it on the center stand my rear tire still touches the ground. So, I actually happen to have some spare shocks from my other two bikes and I thought I'd interchange them with the 900 shocks that are currently on there and see if that migh improve anything. But I don't understand lengths, weight limits, sizes ect. Could anybody help me out?

 

From memory I believe the 650 Seca shocks are 13", the 900 Seca is 12.5"
I have no experience with the 550.

 

900 Secas appear to be 325mm (12.8") eye to eye.

Do I need to replace my 900 Seca rear shocks with the attached reservoir like the originals or should I just get adjustable/progressive ones similar to the ones on my 750 Seca?

 

You can replace them with whatever you like, as long as they are close to the correct length, and have the strength that you want

 

They'll have to be able to hold my 270 lb bulk. I used the Showas from a Maxim on my other 900 because I liked the look of the solid chrome.