If you go to
www.bimba.com and click on the CAD tab then choose your software, click "non repairable stainless steel cylinders", then click original line, select your bore size, then select your mounting option (for FIRST i believe you want the 04-DP, then plug in your stroke size and the model will generate itself for downloading.
Hope this helps.
There is another website (aircylindersdirect.com) that has a similar cad generator but i would trust the bimba one more.
Greg