SVT 5 spoke center plastic covers..

[TLzook]

Requesting some info.. Refurbed 4 1998 Contour SVT rims, 16" x 6.5" to go on my 15 Fiesta. To hard to find 4 clean covers or very costly to get, so I'm deciding to just go with metal center caps from places like the "bay" to cover the center hole, with exposed lugs. Would it be a 60mm (measured) x ?? deep or certain type of clip/retainer.. Thx, SC