The 6-lug 22.5" Budd wheels for the your truck were typically found in the 6", 6.75" and 7.5" widths for tires sizes ranging from 8.25 to 11.00 x 22.5". It seems like the 22.5's are easier to find than the smaller sized 20's. The 6-lug Budds were used on many trucks for decades and should be easy to find. You need to ask around at your local school bus garages and big truck repair shops...if you wait to find them on the internet you may be waiting a long time.
Make sure to replace ALL of the steel and rubber brake lines while your doing the brakes...these line may look good but will fail from the inside out.
Your Hydrovac should have a tag on it with it's model number...NAPA should be able to source a remanufactured unit or send your unit back for a rebuild.
Mike B
