Bus routes over the Erskine Bridge

Are there any bus routes over the Erskine bridge, specifically routes that would link stations on the North Clyde line and the Inverclyde line?

McGill's 757 service from Paisley to Clydebank via the Airport also certain journeys on Citylink services from Argyll and Bute and the West Highlands that call in at the Airport en route to Glasgow

There is also McGill's X22 that links Clydebank to Greenock via Bishopton and Port Glasgow every hour.

There's also the 340 linking Royal Alexandra Hospital in Paisley with Vale of Leven Hospital in Alexandria

Both the X22 and the 757 stop at Clydebank Station and on the main road near Dalmuir Station. The X22 will take you to Bishopton Station every hour as stated above (currently run by Mellor bodied Mercs) with the 757 being half hourly for most of the day which terminates not far from Gilmour Street (tends to be Citaros but can see anything left in the depot appearing). The 340 isn't much use for rail connections south of the river and isn't the most frequent of services.