Guess wheel size? pics inside of a 1979 monte carlo + boss 338 wheels

[CruizinKev]

came across the attached pictures some time ago and really like the look. I was searching for 78/79 monte with boss 338 rims. I remember I found the pics on CL the car was for sale there. I know the pics are very blurry...
however I'm not sure who's car it is and I'm trying to determine the rim / wheel size. it looks like 20x8.5 front and 20x10 on rear? any thoughts or suggestions? thx in advance.






I also just googled around and found this:

http://www.cardomain.com/ride/312977...et-monte-carlo

"American Racing Thrust M, 20x10 rear and 20x8.5 front"

I photoshoped one of his pics - I lowered the car:



so now I really think the wheels in pic 1 & 2 are 20".

what you guys think?

[CruizinKev]

found a 1978 monte carlo with 20" wheels:



so I took that pic and photshopped it:




so comparing the pics - my black monte looks like it has 20"