Have found Spareto.com cheap, they have pretty good stock and are easy to deal with.
The Bosch fuel regulator for Pug part number 1985 05 is here
https://spareto.com/products/bosch-control-valve-fuel-pressure/0-280-160-560 and the rocker gasket is
https://spareto.com/products/elring-gasket-cylinder-head-cover/156-680. Both are in stock and come to less than 30 euros. Shipped as just the two items it would add another 20 euros. Might not make sense as just two items but the smart thing to do is buy filters, plugs, gaskets, bushings etc in one order as additional items (unless they are large and/or heavy) won't add much, if anything, to the freight costs.
As they use DHL for freight prices are very reasonable, its delivered quickly (generally less than a week from order in Estonia to delivered here) and unlike Fedex they don't sting you for import and other clearance fees on arrival into the country. Have ordered various parts in more than a dozen orders and yet to have an issue