Front hanger spacers

Are these common? I need about 1/4 inch more clearance from the front lip of the rear fender on my 8 3/4 rear 65 with these big 235/75R15 series tires so I am going to get a 1/4 plate and just use them as a spacer in front of the front hanger. I know it'll move the driveshaft out 1/4" but I got room as its only 5/8 out as it stands now. Do the hanger studs have that range? My tire is about 2mm from the edge of the rocker now at full extension (frame up on jackstands and tire is clear of ground) and it looks to be about as close as it will get. If I lower it the clearance will get larger as the tire will be farther up in the well and the tire centerline will be higher than that interference point. What is minimum clearance for a tire there? do they expand a little at speed? (kinda doubt it as they are steel belted but who knows). Thanks.
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