I installed 260 doors on my 240 I have found that the 240 regulator does not fit  I purchased 280 regulators they do not fit 

does the 260 have its own regulator?

@zbert1 I don't have the answer to your question but the V.I.N. may help narrow it down if someone does know of an "in-between" regulator. Just did a bit of research. Z Car Source has window regulators. They list a regulator for years 74-76 and a different one for 77-78.

From the online parts catalog for 260Z/280Z:

RH 80700-N3400 to 7607, superseded by 80700-N4400 eff. 7608

LH 80701-N3400 to 7607, superseded by 80700-N4400 eff. 7608

The comment by @Mark Maras is spot on regarding the part # change

You are correct that the 240Z regulators are a different P/N.

BTW - my limited experience with regulators shows the P/N is usually stamped on the part.

Edited December 15, 20186 yr by jfa.series1

Sounds like my 280 regulators are to new.will the 240 windows work if I get the correct regulators.

thanks.

 There's still a question in my mind if the early 260 regulators were the same as the late 260. Does anyone know if the regulator change came with the forward relocation of the inside door lock?

16 minutes ago, Mark Maras said:

 There's still a question in my mind if the early 260 regulators were the same as the late 260. Does anyone know if the regulator change came with the forward relocation of the inside door lock?

Mark,

The catalog shows no changes to regulators, locks, or other parts during the switch from early to later 260Z:

http://www.carpartsmanual.com/datsuns30/Datsun-Z-Index/Body-260Z-280Z/2-Seater/Door-Lock-Regulator-Handle

Here is my early 260z regulator that I had to repair.

Thanks for the info this will help me move forward.

14 hours ago, Mark Maras said:

 There's still a question in my mind if the early 260 regulators were the same as the late 260. Does anyone know if the regulator change came with the forward relocation of the inside door lock?

No, It came with the change of interior style between the 240 and 260.  My early 260Z has the same regulator used in the lates and '75-'76 280Z.  Then there was another door change with the '77-'78 and the regulator changed again...