VHST 28 mm

I have two VHST 28mm carbs, both with 300 float valves, a 40 and a 45 slide, various needles etc. looking to swap for one PHBH 26 or 30 mm. Reason for swap is that I want to use only the PHBH range on my scooters. The VHST carbs have done about 500 miles between them.
Simon
Simon