I did the front crankshaft oil seal and oil pump when I last did the head gasket. New seals are not expensive well £50 say from Saab for the crankshaft oil seal, oil pump 'o' ring and a tube of sealant (can by 500ml tube from Loctite for the same price as the 5ml from Saab!). I think thats all you need (Check Haynes manual). Not to tricky to do providing you can get the crankshaft pulley bolt off.