Presuming a standard setup with a 1310 tailshaft -
The bearing itself is 45mm ID, 75mm OD, 16mm width. OE part number is 183265 but your friendly SKF stockist would do a better price than Mother Volvo.
The rubber retainer is p/n 686668.
FCP carries a Meyle replacement for $8.09 USD + shipping.
https://www.fcpeuro.com/products/volvo-drive-shaft-center-bearing-rubber-cushion-140-240-260-1221635
iPD has them for $7.95 USD + shipping.
https://www.ipdusa.com/products/7421/101177-rubber-driveline-center-carrier-support-bearing-mount-2-inch
Genuine from Mother Volvo? You're looking at $36.75 USD + shipping.
https://www.volvopartswebstore.com/products/Volvo/Bearing-carrier-Genuine-Classic-Part/1158897/686668.html
The spring and support washer can be re-used.
I am considering shortening a 740 tailshaft for use in my 140, as the centre support bearing setup is a different design (stronger apparently), and it's what they used on the Group A cars.
Comparing a 164 BW35 tailshaft next to a 740 wagon tailshaft (longer)