based on lots of other reading on here, 17" wheels on the front have a limit for backspace of about 5.2" as they'll contact the upper ball joint...or maybe it was the outer tie rod, either way, it was an interference limit. If you go with an 18" wheel, it'll tolerate a little more backspace...
This subject is pretty well documented in this part of the forum; just do a search and you'll get a thousand answers. Depends on what you want...how wide do you want to go?
factory valves from Enginetech are:
E2633-8 and I2060-8
Intake
5/16 stem diam
1.94 head diam
4.912 length
Exhaust
8mm stem
1.655 head diam
4.920 length
there's also these...
Mopar Performance Valve
Mopar Performance Valve
Mancini Racing Steel Valve Set - Multi Groove
I'm not sure on the...
what do you mean, aspects? Specifications? (specs?)
Do you know anything about what you need for your setup? length, material, type of lock grooves, etc...part numbers will depend on what you want to install...
If the asking price is for all four wheels and they're not corroded, bent, or have destroyed clearcoat, I believe it's fair, but your local market may vary
It is possible they're offshore knockoffs, but if they've been installed for 20 years, they're probably the genuine article
Those look a whole lot like mustang bullitt wheels...stock from 2001-2004...17x8, stock tires were 245/45/17...
OE ford part numbers are:
1R331007AB
1R331007BB
1R3Z1007AA
...if you felt like verifying, the part number would be on the inboard side of the hub