The A type with the thermo valve connection for manifold vacuum is the better match for your bus. My VW engine manual dates from about 1969 with updates to about August 1974.. A 1700 " T4"engine is listed for the T2 in May 1972. August 1973.. the T2/1700 is superseded by an T2/1800
No shelf but I can easily knock something up, the filter not heavy just to catch it. Cleaned the Beetle Filter ready for sale so on the hunt now for an original filter. Cheers for all advice & help
Sorted found one , engine & Box going back in this weekend so will install and fabricate a shelf to hold the filter.