You'll need to get the bosch number from the cpr.

For an 066 cpr, the bent hole at the top has an open end, with a U shaped house to prevent water ingress. This is an 'altitude compensation' opening. This cpr has a diaphragm in the lower half with two small vent holes in for the vacuum fuel enrichment. Do not drill in the brass 'cap' on these cpr's

For other Volvo/ non ke-jetronic cpr's, the top vent port is connected to the inlet manifold. It looks like you've got one of these. You may need to check if your car has a frequency valve or not, as it may have had the Volvo fuel distributor on too etc