Is a 66 cutlass rearend the same width as a 65?

I think only a half inch or inch wider.

Thanks Nick I actually have that printed out at my desk. But it states (SEE BELOW) that they are the same width up until 68. But the guy selling the 66 says it is wider I'm just trying to confirm. I'm only planning on using the gear set but would like to have the axles as spares if they are the same.

From the 442 article:
Swapping

Interchange Guide
Year From Year To Model(s) Comments
64-66 64-66 GM A-body - Cutlass, Chevelle, LeMans, Skylark Bolt in.
67 64-66 GM A-body Lower spring perch is different, requiring the use of the 67 springs.
68-72 64-66 GM A-body Axles are about an inch wider than the earlier ones and also have the control arm mounting locations in a slightly different place; the axle will physically bolt up to the early car but the pinion angle will be wrong.

I've used axles out of a '70 442 in my Cutlass post coupe for about 30 years now and the axle in my 442 is from a '70 Chevelle. You can get them to bolt up under a 65 with some work, and not a ton of work either. As a matter of fact on a 442 frame with the different upper control arm locations, it's a bit easier. The clearance on the rear quarters is tight, but it does not rub at all.

I had to wrestle the '70 axle in my Cutlass, but it worked great and is so nice having a posi instead of the peg-leg that it came with. You can also rebuild your axle with different gears and posi units from the aftermarket. Either way, to get an axle to withstand the high speed driving you want to do with that LS1 in there, you are going to have to pay anyway.

Rockytopper, I found an EBAY listing for rear end housings. I am not sure if it is what you are looking for but it looks like he is based out of Southlake and might be able to make what you need. cgi.ebay.com/ebaymotors/1957-1964-PONTIAC-OLDSMOBILE-REAR-9-3-AXLE-HOUSING_W0QQitemZ380161286798QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item588360e28e&_trksid=p4506.c0.m245

:0
Do we dare ask what this other direction is?