"Over My Mountain" was the "B-side" of "Caledonia" when Dougie and Alan Roberts [ RIP ] released it as a single on the "Criminal Records" label [ "Stealing Our Way Into Your Heart" ] !!! It was released in 1978.
The 2 tracks I think were taken from an LP they recorded as a duo, also titled "Caledonia".
It shouldn't be difficult to find the words to the "Ploo'boy Laddies" [sic], and if you can't get the lyrics to "Over My Mountain", I'll write them out and post them here for you, but it might be the week-end before I have a chance to do it.
Dougie's pretty good about doing requests - if he didn't sing them when you asked, it's more probable that he just hadn't sung them for a long time.