Long, thin harness dildo?

Hello there! I'm just getting my boyfriend into pegging, and we've run into a bit of a conundrum. He gets on very happily with my Lovehoney Slimline Dildo (5 inch length, 3 inch circumference) and we'd like to try something longer, but the other dildos I have (4.75 and 5 inch circumference) are way too much for him right now. Does anyone know of something more than 5 inches long, 4 inches or less wide, and suitable for use with a harness? Bit specific, I know!

From the research I've been doing, the Tantus Leisure looks like exactly what I want, but it's been discontinued on LH- does anyone know why?