Better chassis for the bigger Buicks

[Monty]

I've got the AMT '65 and '69 Rivieras in the on-deck circle, but I detest the promo-like chassis they come with, so I'm curious what else could be used while still maintaining some semblance of accuracy.  

Options I'm considering:

1) Has anyone tried using the chassis from the '90s-issue '66 Riviera under either one of these?

2) One of our members, David G, built an incredibly nicely detailed X-style chassis for his '60 Impala. http://www.modelcarsmag.com/forums/topic/114936-revell-1960-chevy-july-16-update/?do=findComment&comment=1665365

I don't know jack about these X-style chassis; could this be a reasonable replacement for the AMT junk?  

Any pics and descriptions of chassis transplants for these Rivieras would be appreciated.  

[Can-Con]

As a former 1/1 '69 Riviera owner, I can say the AMT '66 chassis is correct for that swap.

For the '65, the back part behind the wheels is different but IIRC, the rest of the chassis is the same.

[Snake45]

As a former 1/1 '69 Riviera owner, I can say the AMT '66 chassis is correct for that swap.

For the '65, the back part behind the wheels is different but IIRC, the rest of the chassis is the same.

What he said.