5x 4.5 wont fit 5x4 wheels right???

I know this is probaly a stupid question but this guy i know has some cragars for sell and he tells me the are universal bolt pattern and they are on his 70 mach 1, so i have stock wheels on my duster 14 i believe they are refered to as Ralleys?? check my pics out if you dont understand what im saying. So anyway i looked up a mach 1 bolt pattern and its 5x 4.5 but he keeps telling me they are universal and will fit my car. I dont want to actually go through taking off my rim to see if they would fit, i figured asking on here would save me alot of time and effort. So is this true that 5x4.5 wheels will fit my car that has 5x4 wheels on it now??? If not and im interested in getting some cragars in the future should i just search for 5x4 size wheels, this is all new to me im used to bolt patterns like 5x100 or 5x 120 so this 5 x4 is confusing cause i rarely see wheels advertised with that bolt pattern. Thanks for the help guys